The quantum transport theory of electronic conduction in the presence of a strong magnetic field is extended to the case of an applied alternating transverse electric field. The ac magnetoconductivity is calculated for a long-wavelength electric field, ta...

Nonlinear electron dynamics in semiconductor quantum structures define a rich scientific arena with potential impact on novel devices in the terahertz regime. An important concept is photon assisted transport marked by new transport channels, opened by th...

of Quantum Transport Phenomena As stated in its development plan (http://www.univie.ac.at/rektorenteam/ug2002 Professor of Quantum Transport Phenomena The appointment is a full-time, permanent position under private. Candidates have an outstanding record or show exceptional promise in any area ...

We present a fully nonequilibrium calculation of the low-temperature transport properties of a quantum dot in the Kondo regime when an ac potential is applied to the gate. We solve a time-dependent Anderson model with finite on-site Coulomb interaction. The interaction self-energy is calculated up to second order in perturbation theory ...

... FOR Transportable and Hybrid Transportable AC Systems Submitted 11 July, 2005 BY ... FOR Transportable and Hybrid Transportable AC Systems ...

The distribution of the Hall voltage induced by low-frequency AC current is studied theoretically in the incoherent linear transport of quantum Hall systems. It is shown that the Hall-voltage distribution makes a crossover from the uniform distribution to a concentrated-near-edges distribution as the frequency is increased or the ...

This research project was focused on the development of a quantum mechanical balance equation based device simulator that can model advanced, compound, submicron devices, under all transport conditions (AC, DC, and transient response). This report documen...

We present the results on the a.c. transport of electrons moving through a two-dimensional (2D) semiconductor quantum point contact (QPC). We concentrate our attention on the characteristic properties of the high frequency admittance ({omega}{approximately}0 - 50 GHz), and on the oscillations of the admittance in the vicinity of the ...

Alternative current magnetoresistance (AC MR) method was applied to Si MOSFETs and AlGaN/GaN HEMTs at 4.2 K and 300 K. We show that the AC MR method allows to locally determine the quantum and transport relaxation times under the gate of micrometer and submicometer transistors.

... Accession Number : ADD404791. Title : AC technique offers quantum advantage in operation of appearance measuring instruments. ...

We study a two-level quantum dot embedded in a phonon bath and irradiated by a time-dependent ac field, and develop a method that allows us to extract simultaneously the full counting statistics of the electronic tunneling and relaxation (by phononic emission) events as well as their correlation. We find that the quantum noise of both ...

... Descriptors : *QUANTUM ELECTRONICS, QUANTUM THEORY, MILLIMETER WAVES, RESPONSE, SCALE, TRANSPORT, SIZES(DIMENSIONS ...

... Descriptors : *TRANSPORT PROPERTIES, *QUANTUM ELECTRONICS, QUANTUM THEORY, ELECTRIC FIELDS, SEMICONDUCTORS, MONTE ...

We study the quantum version of a tilting and flashing Hamiltonian ratchet, consisting of a periodic potential and a time-periodic driving field. The system dynamics is governed by a Floquet evolution matrix bearing the symmetry of the corresponding Hamiltonian. The dc-current appears due to the desymmetrization of Floquet eigenstates, which become ...

A quantum-classical scheme is presented to study nuclear motion in time-dependent quantum transport. The nuclei are treated in the Ehrenfest approximation. We illustrate the method in terms of model systems results. We show how electron-lattice interactions may induce dynamical Peierls distortions in short wires, and change their ...

We study transport through two ultrasmall quantum dots with discrete energy levels to which a time-dependent field is applied (e.g., microwaves). The AC field causes photon-assisted tunneling and also transitions between discrete energy levels of the dots. Using the Floquet-matrix technique we propose an electron pump consisting of two ...

... ADP012876 TITLE: Quantum Transport Theory for Semiconductor Superlattices ... Quantum transport theory for semiconductor superlattices ...

We present a detailed theoretical investigation on the transport properties of the one dimensional quantum rings. The Aharonov-Bohm effects under the low-voltage and low-frequency perturbation have been carefully studied. Scattering matrix method is adopted to obtain the ac response at external perturbation. The results show that the ...

The Ehrenfest-time scale in quantum transport separates essentially classical propagation from wave interference and here we consider its effect on the transmission and reflection through quantum dots. In particular, we calculate the Ehrenfest-time dependence of the next-to-leading-order quantum corrections to the ...

... 123. Percent Complete by Mode of Transportation (ACS). Overview ... Percent Complete by Mode of Transportation (ACS). -. -. Links on this page: Page ...

It is shown that the minority carrier diffusion contribution to the ac quantum efficiency of a semiconductor photodiode is a function of the product of the absorption coefficient (alpha) and the diffusion length (L) of the semiconductor material. Since L ...

... Accession Number : ADA013549. Title : Diffusion Limited AC Quantum Efficiency of Photodiodes. Descriptive Note : Final technical rept.,. ...

We propose a scheme for coherent rotation of the valley isospin of a single electron confined in a carbon nanotube quantum dot. The scheme exploits the ubiquitous atomic disorder of the nanotube crystal lattice, which induces time-dependent valley mixing as the confined electron is pushed back and forth along the nanotube axis by an applied ac electric ...

... Title : Quantum Theory of Electron Transport in Mesoscopic Systems. ... Subject Categories : QUANTUM THEORY AND RELATIVITY. ...

... The primary benefits of a TACS or HTACS system for the Military ... basis for larger scale implementation of with solar powered tactical AC systems. ...

Using matter waves that are trapped in a deep optical lattice, dissipationless directed transport is demonstrated to occur if the single-band quantum dynamics is periodically tilted on one half of the lattice by a monochromatic field. Most importantly, the directed transport can exist for almost all system parameters, even after ...

I present research on ballistic electron transport in lateral GaAs/AlGaAs quantum dots connected to the environment with leads supporting one or more fully transmitting quantum modes. The first part of this dissertation examines electron the phenomena which mediate the transition from quantum mechanical to ...

... Transport; Quantum Transport; Fluctuations; Semiconductor Physics; Master Equation; Boltzmann Equation; Langevin Equation; Green Functions ...

Here we investigate high frequency AC transport through narrow graphene nanoribbons with top-gate potentials that form a localized quantum dot. We show that as a consequence of the finite dwell time of an electron inside the quantum dot (QD), the QD behaves like a classical inductor at sufficiently high frequencies ...

Here we investigate high frequency AC transport through narrow graphene nanoribbons with top-gate potentials that form a localized quantum dot. We show that as a consequence of the finite dwell time of an electron inside the quantum dot (QD), the QD behaves like a classical inductor at sufficiently high frequencies ...

We demonstrate a technique for exciting spin waves in an ultracold gas of 87Rb atoms on the basis of tunable ac Stark potentials. This technique allows us to excite normal modes of spin waves with arbitrary amplitudes in the trapped gas, including dipole, quadrupole, octupole and hexadecapole modes. These modes exhibit strong nonlinearities, which manifest as amplitude ...

These devices use tunneling, quantum wells, and superlattices to achieve higher ..... barriers, perpendicular quantum transport phenomena in superlattices, ...

... SPECTROSCOPY, *ELECTRON TRANSPORT, *SEMICONDUCTORS, *TUNNELING(ELECTRONICS), *QUANTUM DOTS, *NANOTECHNOLOGY ...

The authors calculate the a.c.-admittance of a two dimensional quantum point contact (QPC) using a Boltzmann-like kinetic equation derived for the partial Wigner distribution function. An integral equation for a potential inside a QPC is solved numerically. The dependence of the admittance on the frequency of the a.c. field is found in a wide frequency ...

... Extension to AC Loss Minimisation in High Temperature Superconductors ... The transport AC loss decreases more than 3 times. ...

Here we report theoretical transport calculations on carbon-based nanomaterials used as resonator cavities under the effects of a time-dependent field. A magnetic field is considered as an extra modulator tool, able to encode binary ON or OFF transmission states on the quantum systems. Regular either complex conductance Fabry-P�rot patterns mapped onto ...

Silicon quantum dot based qubits have emerged as an appealing approach to extending the success of GaAs spin based double quantum dot qubits. Research in this field is motivated by the promise of long spin coherence times, and within a MOS system the potential for variable carrier density, very small dot sizes, and CMOS compatibility. In this work, we will ...

Abstract. We review the quantum transport of ultra-cold alkali atoms trapped in a one-dimensional optical lattice of double-potential wells, engineered through a combination of ac-Stark shifts and Zeeman interactions. The system is modelled numerically through analysis of the bandstructure and integration of the time-dependent ...

We have introduced a source-drain voltage switching technique for studying nuclear spins in a vertical double quantum dot. Switching the source-drain voltage between the spin-blockade state and the zero-bias Coulomb blockade state can tune the energy difference between the spin singlet and triplet, and effectively turn on/off the hyperfine interaction. Since the change in the ...

... TRANSPORT VIA MOMENTS OF QUANTUM DISTRIBUTION FUNCTIONS ... limit from the equation of motion of the Wigner function and was found to ...

... THE STUDY OF QUANTUM SCATTERING PHENOMENA IN NEXT ... aspects of transport begin to play a ... of one such phenomenon, photon recycling ...

... Title : Theoretical Studies of Electron ... QUANTUM ELECTRONICS, ELECTRON TRANSPORT ... STRUCTURES, TIME, ELECTRONS, PROFILES ...

A quantum-mechanical transport equation (QMTE) is derived which should be applicable to a wide range

... electronics, single-particle lifetimes in quasi-1D structures, quantum transport experiments in metals, the mesoscopic photovoltaic effect, and new ...

... electronics, single-particle lifetimes in quasi-1D structures, quantum transport experiments in metals, the mesoscopic photovoltaic effect, and new ...

... QUANTUM THEORY, *ELECTRON TRANSPORT ... COHERENCE, CHARGE CARRIERS, MONTE ... METHOD, REGIONS, ELECTRONS, PROFILES ...

... 42 LOW TEMPERATURE TRANSPORT THROUGH A QUANTUM DOT: THE ANDERSON MODEL OUT OF EQUILIBRIUM by ...

... Descriptors : *QUANTUM WIRES, ELECTRON GAS, FERMI SURFACES, TRANSPORT PROPERTIES, GROUP VELOCITY, HETEROGENEITY ...

... Title : Ballistic Electron Emission Spectroscopy Study of Transport through Semiconductor Quantum Wells and Quantum Dots. ...

Page 1. A SEMICLASSICAL TRANSPORT MODEL FOR THIN QUANTUM BARRIERS by Kyle A. Novak A dissertation submitted ...

This paper compares the current density (J) versus applied bias (V) of self-assembled monolayers (SAMs) of three different ethynylthiophenol-functionalized anthracene derivatives of approximately the same thickness with linear-conjugation (AC), cross-conjugation (AQ), and broken-conjugation (AH) using liquid eutectic Ga-In (EGaIn) supporting a native skin (~1 nm thick) of ...

... Title : Phase Coherent Electron Transport in Open Quantum Dots and Quantum Dot Arrays. Descriptive Note : Conference proceedings. ...

-existing channel of shared quantum entanglement; and one of classical communication used for Alice to trans- mit was beaten only when sender and receiver had access to shared entanglement. 6. Conclusion Quantum: Quantum transport through a classical channel, Entanglement assisted transport of ...

We have studied the feasibility of photon assisted quantum transport in semiconductor quantum point contacts or electron waveguides. Due to photon-induced intersubband transitions, it is expected that the drain/source conductance of the quantum point cont...

Direct conversion detectors offer the potential for very high resolution and high quantum efficiency for x-ray imaging, however, variations in signal can arise due to incomplete charge collection. A charge transport model was developed to describe the signal and noise resulting from incomplete charge collection. This signal to noise ratio (SNR) reduction ...

The dc and ac electrical transport property of polyvinyl alcohol-multiwall carbon nanotubes composites has been investigated within a temperature range 77<=T<=300 K and in the frequency range 20 Hz-1 MHz in presence as well as in absence of a transverse magnetic field up to 1 T. The dc conductivity follows variable range hopping model. The ...

We present phonon dispersions of Si nanowires using ab initio and linear response theory. The effects of nanowire surface structures, growth directions, and quantum confinement on phonon dispersions and phonon confinement are also discussed. The thermal conductivity of Si nanowires using the obtained full dispersion curves are also evaluated, using Boltzmann ...

Charge transport is dynamically and strongly linked with atomic structure, in nanostructures. We report our ab-initio calculations on electronic transport through atomic chains and the model calculations on electron-electron and electron-phonon scattering rates in presence of random impurity potential in a quantum well and in a ...

A transmission line (TL) model of a carbon nanotube (CNT) is analyzed through the Boltzmann transport equation (BTE). With the help of a numerical solution of the BTE, we study the kinetic inductance (LK), quantum capacitance (CQ) and resistivity (RS) of a CNT under a high frequency electric field. Values of LK and CQ obtained from BTE accord with the ...

Double quantum dots in the strong Coulomb blockade regime are realizations of two-level systems defined from two tunnel--splitted ground states, which are separated by a large energy gap from the remaining many--particle states. The interactions between electrons and bosonic degrees of freedom (photons, phonons) in these systems can be tested and manipulated in electronic ...

A quantum-mechanical definition of the capacitance of a molecule or nanodevice between two electodes is complicated by the fact that one cannot unambiguously partition the electron density between the metal electrodes and the molecule or device. We introduce a procedure that leads to an unambiguous partitioning and to practical calculations using a linear response formalism ...

We construct a real time current-conserving functional renormalization group (RG) scheme on the Keldysh contour to study frequency-dependent transport and noise through a quantum dot in the local moment regime. We find that the current vertex develops a nontrivial nonlocal structure in time that is governed by a new set of RG equations. Solving these RG ...

In the ACS/HRC CCD a single UV photon may generate more than one photo-electron. We calculate the theoretical quantum yield and discuss the impact on the calculation of the S/N ratio for an observation in the UV. Without such correction the S/N can be overestimated up to ~18 % in the F220W and ~26 % at the bluest edge of PR200L. The implementation of the ...

Since the quantum Hall resistance (QHR) measured with alternating current (ac) has reached the state of an excellent quantum standard of impedance, we have realized a quadrature bridge with two ac QHRs to accurately calibrate capacitance standards in terms of the SI value of the von-Klitzing constant, without the ...

We will present in this talk experimental results obtained in a lateral quantum dot array sample, with a pitch size of � 350 nm and a designed dot size of � 150nm. The starting material is a high quality quantum well with the two-dimensional electron gas buried 200 nm below the surface. The quantum dot array is defined by a Ti/Au ...

A theory for the spontaneous emission of radiation for a Bloch electron in a single superlattice (SL) energy band under the influence of an external, spatially homogeneous, classical ac electric field is presented. The classical external ac electric field is described in the vector-potential gauge. The quantum radiation field is ...

... The photon rate equation is ... SURFACES, VARIATIONS, TRANSPORT PROPERTIES ... INTERFEROMETERS, PATTERNS, PHOTONS, QUANTUM ...

... Descriptors : *Semiconducting films, *Quantum theory, *Indium antimonides, Semiconductors, Metalloids, Bismuth, Transport properties, Optical ...

... As a consequence, it is quite likely that critical dimensions will soon be comparable to quantum coherence lengths for the particles 'Involved in the ...

... tunneling and photon-assisted escaping ... DEPENDENCE, *ELECTRON TRANSPORT, *QUANTUM ... ELECTRIC DISCHARGES, PHOTONS, DIRECT ...

and coupled nano-scale semiconductor structures (heterostructures, quantum wells, superlattices, and quantum dots). Emphasis is on quantum transport and photoluminescence...

This paper reviews the role of quantum mechanics in biological systems, and shows how the interplay between coherence and decoherence can strongly enhance quantum transport in photosynthesis.

These devices use tunneling, quantum wells, and superlattices to achieve higher ..... barriers, perpendicular quantum transport phenomena in superlattices, ...

... We have also neglected phonon scattering based on over the doped region in the quantum well to obtain the ... Sdoped regions of the quantum well. ...

We present ac microcalorimetry and resistivity measurements under high pressure on new very pure single crystals of YbCu2Si2 having residual resistivity ratios of up to 130 and residual resistivities of less than 1 ??cm. The onset of magnetic order at high pressure has been detected by ac micro-calorimetry in a diamond anvil cell, and the phase diagram has ...

Jan 22, 2011 ... dc.language.iso, en_US, -. dc.subject.other, transport tunneling quantum, en_US. dc.title, Quantum and semi-classical transport in RTDs ...

The objective of this research program is to study theoretically the underlying principles of quantum transport in solids. The specific areas of research are those of Bloch electron dynamics, quantum transport in oscillating electric fields or in periodic...

Quantum walks on directed graphs Ashley Montanaro University of Bristol montanar@cs.bris.ac.uk Introduction � Quantum walks are a new model for quantum com- putation that have been used to produce novel quan- tum algorithms (e.g. [3]) on undirected graphs. � We consider the definition of ...

We present a theoretical study of ac charge transport arising from adiabatic temporal variation of zero-field spin splitting in a quasi-one-dimensional hole system (realized, e.g., in a quantum wire or point contact). As in conduction-electron systems, part of the current results from spin-dependent electromotive forces. We find that ...

Distributed quantum information processing requires a reliable quantum memory and a faithful carrier of quantum information. Atomic qubits have very long coherence times and are thus excellent candidates for quantum information storage, whereas photons are ideal for the transport of ...

A microscopic theory of the transport properties of quantum point contacts giving a unified description of the normal conductor-superconductor ({ital N}-{ital S}) and superconductor-superconductor ({ital S}-{ital S}) cases is presented. It is based on a model Hamiltonian describing charge transfer processes in the contact region and makes use of ...

Between 2000 and 2003 Transportable AC Systems (TACS) and Hybrids (HTACS) were developed and demonstrated to support the electrical requirements of Command Centers in the field. Primary power was provided by unbreakable, lightweight, flexible solar module...

Using high-accuracy numerical methods the author investigates the dynamics of independent electrons in both ideal and realistic superlattices subject to arbitrary ac and/or dc electric fields. For a variety of superlattice potentials, optically excited initial wave packets, and combinations of ac and dc electric fields, he numerically solves the ...

... Accession Number : ADA290493. Title : Transport Phenomena and Noise in Real Quantum Wires. Descriptive Note : Final rept. 30 Mar 92-1 Sep 94, ...

During the period April 15, 1992 to April 14, 1993, research carried out by the Nanostructures Group in the Department of Electrical Engineering at Notre Dame was concerned with a variety of quantum transport in mesoscopic structures. This research was fu...

Page 1. c AD-A264 935 1993 .,., .e; Annual Report on Grant AFOSR-91-0211 Quantum Transport Craig S. Lent, Wolfgang ...

... Accession Number : ADA260184. Title : Low Temperature Transport Through a Quantum Dot: the Anderson Model Out of Equilibrium. ...

This talk reviews, from an historical perspective, a chapter in the development of quantum transport theory within the framework of self-consistent non-equilibrium Green's functions.

A workshop was held on the topic of quantum transport in semiconductor devices. This workshop brought together 17 lecturers and 35 other attendees for this purpose.

... Accession Number : ADA450562. Title : A Semiclassical Transport Model for Thin Quantum Barriers. Descriptive Note : Doctoral thesis. ...

... ADA444718. Title : A Semiclassical Transport Model for Thin Quantum Barriers. Corporate Author : WISCONSIN UNIV-MADISON. ...

We develop electron transport theory for novel devices [1,2], which are interesting in the context of correlated electrons physics. The device proposed in Ref. [1] is designed for an observation of a non-Fermi-liquid behavior of itinerant electrons. The device measured in Ref. [2] may serve a similar purpose, and also may become important for quantum ...

The experimental demonstration of the Josephson effect is a direct manifestation of the quantum phase of the superconductive order parameter and of the coupling of this phase to the electromagnetic field. The ac Josephson effect links the time evolution o...

We investigate the ballistic spin transport in a multimode quantum wire with strong Rashba spin-orbit coupling and an oscillating potential. A spin-resolved Floquet scattering matrix and Floquet spin density matrix formalism is employed to study the transport properties, such as conductance and spin polarizations, of the device. Due to ...

The complex dielectric permittivity (?*=?'?j?'') and ac conductivity ? (?, T) as a function of temperature (90�375 K) and frequency (0.4 kHz to ?100 kHz) were measured in this work for polycrystalline samples of hydroxyl ammonium sulfate, (NH3OH)2SO4. The measured electrical parameters revealed the existence of a structural phase transition at T?312 K, which was further ...

We report transport measurements for quantum wires formed in undoped GaAs/AlGaAs heterostructures. The density of the 2D electrons, induced with an external gate, can be varied from 2 x10^10 to over 3 x10^11 cm-2. Quantum wires are patterned using wet or dry etching that creates split gates and a central top gate. When a single 1D ...

We prepare an etched gate tunable quantum dot in single-layer graphene and present transport measurement in this system. We extract the information of the ground states and excited states of the graphene quantum dot, as denoted by the presence of characteristic Coulomb blockade diamond diagrams. The results demonstrate that the ...

The quantum Smoluchowski equation for the reduced Wigner function in configuration space pertaining to the quantum Brownian motion of a particle in a tilted cosine potential in the high dissipation (or noninertial) limit as applied to a model point Josephson junction (namely, a resistively shunted junction in the presence of noise and an arbitrarily large ...

... in ac quantized Hall resistance measurements are 1233 ... Bw(z) are magnetic flux densities generated by ... a constant magnetic flux density that does ...

tamaru@math.sci.hiroshima-u.ac.jp , . , " " . 1 , J�urgen Berndt (University College Cork, Ireland

... It is also important for estimating the line shape functions at low-carrier densities. ... the ac-Stark effect under low real-excited carrier density conditions ...

We discuss the concept of local temperature for quantum systems driven out of equilibrium by ac pumps showing explicitly that it is the correct indicator for heat flow. We also show that its use allows for a generalization of the Wiedemann-Franz law.

Cooling at the quantum limit and RF refrigeration Jukka Pekola Low Temperature Laboratory, Helsinki) Francesco Giazotto (SNS Pisa) Yuri Pashkin (NEC) #12;Outline Electronic refrigeration Classical vs quantum (electromagnetic) heat transport Cooling at the quantum limit: experiments RF refrigeration in a single

We report an investigation of ac quantum transport properties of a nanocapacitor from first principles. At low frequencies, the nanocapacitor is characterized by a static electrochemical capacitance C? and the charge relaxation resistance Rq . We carry out a first principle calculation within the nonequilibrium Green�s function ...

May 2, 2003... of the quantum fluids: Self-organized heat transport in liquid helium ... physical and biological systems that exhibit active transport. ...

... PHYSICS, RESONANCE, TRANSPORT, GROUP III COMPOUNDS, GROUP V COMPOUNDS, QUANTUM ELECTRONICS, INVERSION, KINETICS ...

... PHYSICS, RESONANCE, TRANSPORT, GROUP III COMPOUNDS, GROUP V COMPOUNDS, QUANTUM ELECTRONICS, INVERSION, KINETICS ...

We investigate a singly charged quantum dot under a strong optical driving field by probing the system with a weak optical field. We observe all critical features predicted by Mollow for a strongly driven two-level atomic system in this solid state nanostructure, such as absorption, the ac-Stark effect, and optical gain. Our results demonstrate that even ...

A quantum molecular dynamics method is proposed to study the transport of a quantum particle interacting with a classical system at finite temp- eratures in the presence of an applied electric field. Using this method the mobility of an excess electron in dense helium gas is calculated at 77 k. (AIP)

The vibrational spectra of UBz and ThBz have been measured in solid argon. Complementary quantum chemical calculations have allowed the assignments of the vibrational spectra. According to the calculations, AcBz are stable molecules, as well as other species like BzAcBz and BzAc2Bz. Experimentally, there is no ...

... Descriptors : *ELECTRON TRANSPORT, *PREDICTIONS, *ELECTRONS, *LASERS, SEMICONDUCTORS, FAR INFRARED RADIATION ...

... Descriptors : *SUPERLATTICES, *MULTIPLE QUANTUM WELLS, HIGH TEMPERATURE, ELECTRON TRANSPORT, RESONANCE, TUNNELING ...

transport, quantum information, and nanomechanics. Markus, one of Jehovah's Wit- nesses, spends his free

... EQUIPMENT, SEMICONDUCTORS, TRANSPORT PROPERTIES, ARSENIDES, PHOTOCONDUCTIVITY, INDIUM COMPOUNDS, METALLOIDS. ...

... MECHANICS, FERMIONS), OPERATORS(MATHEMATICS), TRANSFORMATIONS ... DISTRIBUTIONS, DIAGRAMS, QUANTUM STATISTICS ...

... ELECTRON TRANSPORT, QUANTUM WELLS, ELECTROLUMINESCENCE, GALLIUM ARSENIDES, ALUMINUM GALLIUM ARSENIDES ...

... Subject Categories : PHYSICAL CHEMISTRY NUCLEAR PHYSICS & ELEMENTARY PARTICLE PHYSICS QUANTUM THEORY AND RELATIVITY ...

... TRANSPORT PROPERTIES), (*OPERATORS(MATHEMATICS), *MATRICES( MATHEMATICS)), PERTURBATION THEORY, QUANTUM THEORY. ...

Bohmian mechanics contradicts quantum mechanics Arnold Neumaier Institut fur Mathematik, Universit://solon.cma.univie.ac.at/#24;neum/ Abstract. It is shown that, for a harmonic oscillator in the ground state, Bohmian mechanics and quantum for claiming that Bohmian mechanics reproduces all predictions of quantum ...

In June, 1971, the Cleveland Transit System received a grant contract (Project OH-06-0006) from the Department of Transportation's Urban Mass Transportation Administration to test and evaluate on three rapid transit cars an AC propulsion system developed ...

Correlation function expressions for calculating transport coefficients for quantum-classical systems are derived. The results are obtained by starting with quantum transport coefficient expressions and replacing the quantum time evolution with quantum-classical Liouville ...

... 1. Does the totality of the preclinical and clinical data verify that DaTSCAN allows visualization of the dopamine transporter distribution within the human ...

... SUPERCONDUCTORS, *ELECTRIC FIELDS, *ALTERNATING CURRENT ... SURFACE PROPERTIES, THINNESS, SCALAR FUNCTIONS, LOSSES ...

We demonstrate ElectroWetting-On-Dielectric (EWOD) transport and SQUID gradiometer detection of magnetic nanoparticles (MNPs) suspended in a 2 microl de-ionized water droplet. This proof-of-concept methodology constitutes the first development step towards a highly sensitive magnetic immunoassay platform with SQUID readout and droplet-based sample handling. Magnetic ...

In this paper, we review recent developments in the emerging field of electron quantum optics, stressing analogies and differences with the usual case of photon quantum optics. Electron quantum optics aims at preparing, manipulating and measuring coherent single electron excitations propagating in ballistic conductors such as the edge ...

We investigate two models for performing topological quantum gates with the Aharonov-Bohm (AB) and Aharonov-Casher (AC) effects. Topological one- and two-qubit Abelian phases can be enacted with the AB effect using charge qubits, whereas the AC effect can be used to perform all single-qubit gates (Abelian and non-Abelian) for spin ...

In this report quantum mechanical expressions and computer codes are given to calculate the transport collision integral. The approach is by numerical integration of the Schroedinger equation to obtain quantum phase shifts with subsequent summation of the phase shifts to obtain quantum cross sections. Once the ...

Crystalline defects, their transport and interactions with impurities in potassium and rubidium azides have been studied by measuring the electrical conductivity with ac and dc techniques, the diffusion by a tracer sectioning technique and by the measurem...

Jan 22, 2011 ... dc.language.iso, en_US, -. dc.subject.other, quantum transport semi-classical transport tunneling NEMO, en_US ...

... important concept is photon assisted transport marked by new transport channels, opened by the absorption or emission of one or more photons. ...

We analyze the problem of directed quantum transport induced by external exponentially correlated telegraphic noise. In addition to quantum nature of the heat bath, nonlinearity of the periodic system potential brings in quantum contribution. We observe that quantization, in general, enhances classical current at ...

We study quantum transport in a general graphene system subject to external potential, a situation that can be expected in all kinds of future graphene-based electronic devices with quantum dots and quantum point contacts. We find that electrons tend to take on propagating paths due to Klein tunneling that have ...

Effective transport of quantum information is an essential element of quantum computation. We consider the problem of transporting a quantum state by using a moving potential well while maintaining the encoded quantum information. In particular, we look at a set of cases ...

Optical transitions in a Lens-Shaped Quantum Dot (LSD) are investigated in the presence of a hydrogenic impurity. The electronic wave functions are obtained analytically and the energy eigenvalues are calculated numerically. The density matrix formulation with the intersubband relaxation are used to evaluate the (linear and third order nonlinear) absorption coefficient ...

The photon-assisted shot noise through a quantum dot in the Kondo regime is investigated by applying time-dependent canonical transformation and non-crossing approximation technique. A basic formula for the photon-assisted shot noise is obtained. The rich dependence of the shot noise on the external ac field and temperature is displayed. At low temperature ...

Transport properties in the relativistic analog of the periodically kicked rotor are contrasted under classically and quantum mechanical dynamics. The quantum rotor is treated by solving the Dirac equation in the presence of the time-periodic delta-function potential resulting in a relativistic quantum mapping ...

. Saraceno, Transport phenomena in the asymmetric quantum multibaker map, Phys. Rev. E 77, 011126 (2008). � L and Quantum Physics Workshop, ICTP, Trieste, Italy. � poster: Transport phenomena in the asymmetric quantum, Universidad Polit�cnica de Madrid, Madrid, Spain. * talk: ...

We have investigated the current for the system of vibrating quantum dot irradiated with a rotating magnetic field and an oscillating magnetic field by nonequilibrium Green's function. The rotating magnetic field rotates with the angular frequency ? around the z-axis with the tilt angle ?, and the time-oscillating magnetic field is located in the z-axis with the angular ...

There is intense interest in exciton condensation effects that can occur in bilayer systems. While exciton condensation effects have been studied in quantum hole bilayers, transport experiment in the exciton condensation regime of electron-hole bilayers have proved to be extremely difficult. We present the fabrication details and device measurements of ...

Recently, much effort has been devoted to the development of physical qubits for integration into quantum computers. Qubits allowing control with electric fields are attractive, as ac magnetic fields are more difficult to generate and localize on the nanoscale. The material properties of InAs allow efficient driving of electron spin resonance via the ...

quantum mechanical scattering problems for supercell geometry as sparse linear systems, and solve them by iterative methods. Recent improvement in solution ...

... 7. MA Stroscio, KW Kim, and S. Rudin, "Boundary Conditions for Electron-LO- Phonon Interaction in Polar Semiconductor Quantum Wires," Superlatt ...

transport, quantum information, and nanomechanics. Markus, one of Jehovah's Wit- nesses, spends his free quantum interfer- ence devices (SQUIDS)). The excitement of this field is due to the fact that the laws

Quantum Multiple Scattering Model of Heavy Ion Fragmentation (QMSFRG) ... Task in support of the Measurements and Transport Phase 2 Physics Project (ID No. ...

... Quantum dots afford the most controllable quantum system presently being investigated, because DC voltages applied to gates control the ...

... Figure 2. Current-voltage-temperature characteristics of a single-quantum- dot nanostructure, indicating resonant tunneling through the discrete ...

... of fabricating quantum wires that can provide extremely high electron mobility and high optical absorption, the Aharonov-Bohm effect along with its ...

71 Terahertz Band Device Modeling 71 Physics Models for Transport in Compound Semiconductors 72 Quantum Information 73 Architectures for Fault-Tolerant Quantum Computing 73...

... A new version, based upon a Green's function solution ... distance is now just that of the first barrier. If the two barriers were equal when the quantum ...

... quantum dots; two-phonon processes in photon absorption; phonon effects on carrier transport in nanowires, including wurtzite-based nanowires ...

Mesoscopic circuits cooled down to low temperatures witness marked non-local effects in their transport properties because of electron coherence-electron wavefunctions spread over the sample and correlate its different parts. One of the consequences is that, in one dimension, the maximum d.c. conductance is quantized in steps of e2/h. Here we extend the concept of `universal ...

We present transport measurements of a tunable silicon metal- oxide-semiconductor double quantum dot device with lateral geometry. Experimentally extracted gate-to-dot capacitances show that the device is largely symmetric under the gate voltages applied. Intriguingly, these gate voltages themselves are not symmetric. Comparison with numerical simulations ...

AC losses in a superconductor strip are numerically evaluated by means of a finite element method formulated with a current vector potential. The expressions of AC losses in an infinite slab that corresponds to a simple model of infinitely stacked strips are also derived theoretically. It is assumed that the voltage-current characteristics of the ...

The counterflow transport in quantum Hall bilayers provided by superfluid excitons is locked at small input currents due to a complete leakage caused by the interlayer tunneling. We show that the counterflow critical current IcCF above which the system unlocks for the counterflow transport can be controlled by a tilt of magnetic ...

Ballistic electronic transport along the Quantum Hall edge states of two dimensional electron gases presents strong analogies with the propagation of photons which have been best illustrated by the realization of electronic Mach-Zehnder interferometers [1]. The analogy can be pushed to quantum optics where single electron emitters are ...

A dc current can be pumped through a nanostructure by two out-of-phase ac driving fields. In this approach, we investigate the pumped current properties driven by multiharmonic ac fields in nanowire structures. Considering the first five harmonics, the adiabatically pumping properties driven by approximate square, sawtooth, and triangle-shape ...

. Synthesis and Characterization of Poly(Acrylic Acid) Stabilized Cadmium Sulfide Quantum Dots. J. Phys. Chem in Colloidal Quantum Dots Leading to Enhanced Photovoltaic Device Efficiency D. Aaron R. Barkhouse, Andras G Passivate Recombination Centers in Colloidal Quantum Dots Leading to Enhanced Photovoltaic Device Efficiency

A system is proposed for detecting the effect of a weak classical force on a macroscopic mechanical oscillator. The novel feature is a type of ac bridge coupled to a SQUID amplifier. A detailed sensitivity calculation for one type of bridge excitation is reported which shows what is required to reach the standard quantum "limit." Another type of excitation ...

interpretation of quantum mechanics. Ac- cording to de-Broglie{Bohm theory, one uses the similarity between, India Abstract We shall in the framework of Bohmian quantum gravity show that it is pos- sible to #12;nd, a similar perturbative method is presented [6] to solve the quantum Hamilton{Jacobi equation in ...

Quantum transport in two-dimensional electron systems (2DES) has been one of the major topics in condensed matter physics for many years. Although extensive studies have been performed in the regime of the quantum Hall effect (QHE) where a high magnetic field (typical B � 10 T) is required, much less attention has been paid to the ...

Quantum transport effects including electron or hole tunneling through potential barriers and buildup in quantum wells are important in predicting the performance of ultra-small semiconductor devices. These effects can be incorporated into the hydrodynami...

A quantum theory of charged beam propagation in transport magnetic structures is developed. The time coordinate of quantum mechanics is replaced by the propagation coordinate and the beam emittance takes the place of Planck's constant. Coherent beam distr...

Quantum interferences yield corrections to the classical ohmic behaviour predicted by Boltzmann theory in electronic transport: for instance the well-known ''weak localization'' effects. Furthermore, very recently, quantum interference effects have been p...

Kinetic characteristics of the electron transport in a free standing quantum well are studied theoretically. The quantization of acoustic phonons in a free standing quantum well is taken into account and electron interactions with confined acoustic phonon...

The physics of quantum transport is re-examined as a problem in quantum chaos. It is proposed that the ''random potential'' in which electrons in dirty metals move is not random at all, but rather any potential inducing the electron motion to be chaotic. ...

Attention is focused on the normal quantum fluid, that is, a quantum fluid for which, in the hydrodynamic regime, the equations of momentum and heat transport turn out to have the familiar Navier--Stokes form. Examples are exp 3 He above a few millidegree...

Current research in the quantum theory of transport phenomena is reviewed. Solid state and statistical mechanical considerations necessary for an understanding of the phenomena are outlined. The correlations between observed transport phenomena and parauneters of transport theory are described. ...

PurposeAs a continuing effort to understand the mechanisms of alternating current (AC) transdermal iontophoresis and the iontophoretic transport pathways in the stratum corneum (SC), the objectives of the present study were to determine the interplay of AC frequency, AC voltage, and iontophoretic ...

We have developed a quantum noise approach for studying quantum transport through nanostructures. The nanostructures, such as quantum dots, are regarded as artificial atoms, subject to quasi-equilibrium fermionic reservoirs of electrons in biased leads. Noise operators characterizing the ...

Recently, small-scale quantum communication has been realized by transporting entangled photons, rendering potentially feasible quantum networks on large scales. We propose a class of quantum networks comprising quantum repeaters for long-distance information transport and ...

Recently, small-scale quantum communication has been realized by transporting entangled photons, rendering potentially feasible quantum networks on large scales. We propose a class of quantum networks comprising quantum repeaters for long-distance information transport and ...

The nonlinear behavior of low-dimensional electron systems attracts a great deal of attention for its fundamental interest as well as for potentially important applications in nanoelectronics. In response to microwave radiation and dc bias, strongly nonlinear electron transport that gives rise to unusual electron states has been reported in two-dimensional systems of electrons ...

The purpose of the study reported here was to examine generic cost differences between direct current (dc) and alternating current (ac) systems and to identify situations in which dc is clearly advantageous for long distance and bulk power transport. The ...

We reveal from numerical study that the optical Hall conductivity sigma(xy)(omega) has a characteristic feature even in the ac ( approximately THz) regime in that the Hall plateaus are retained both in the ordinary two-dimensional electron gas and in graphene in the quantum Hall regime, although the plateau height is no longer quantized in ...

The field-tuned ac susceptibility of Mn12Ac single crystal has been measured as functions of temperature and frequency. Two relaxation processes appear in our measurement. One is related to the magnetic quantum tunnelling of a collective spin S = 12 by a 61 K magnetic barrier and it has been well studied, while the other is faster than ...

In this paper we investigate the joint effects of the electron-phonon interaction and an external alternating (ac) gate voltage on the spectral density of shot noise through a vibrating quantum dot system, by applying the Lang-Firsov canonical transformation and the Keldysh nonequilibrium Green's function (NGF) technique. We find that the effects of the ...

Individual InAs/GaAs quantum dots are studied by micro-photoluminescence. By varying the strength of an applied external magnetic field and/or the temperature, it is demonstrated that the charge state of a single quantum dot can be tuned. This tuning effect is shown to be related to the in-plane electron and hole transport, prior to ...

Spin Blockades in the Transport through Quantum Dots Dietmar Weinmann Institut de Physique et quantum dots, coupled to leads via tunnel barriers [1], are among the most promising areas of present on spin effects in quantum dots. This effort is motivated by the recent development of a novel kind

The author presents an experimental and theoretical study of quantum ballistic transport in quantum point contacts (QPCs), defined in the two-dimensional electron gas (2DEG) of a high-mobility GaAs/Al(0.33)Ga(0.67)As heterojunction. In zero magnetic field...

An experimental and theoretical study of quantum ballistic transport in Quantum Point Contacts (QPCs), defined in the 2-D electron gas of a high mobility GaAs/Al0.33Ga0.67As heterojunction is presented. In zero magnetic field the conductance of QPC shows ...

To investigate the effect of quantum coherence on electronic energy transfer, which is the subject of current interest in photosynthesis, we solve the problem of transport for the simplest model of an aggregate of monomers interacting through dipole-dipole forces using both quantum and classical dynamics. We conclude that for realistic ...

Recently, Spin Blockade (SB) transport through quantum-dots has attracted attention owing to potential applications in quantum state control. In this talk, we identify the mechanism underlying current collapse (NDR), current leakage and bias dependent asymmetry in the I-V characteristics of quantum dot systems, ...

The evolutionary decrease in the size of an individual semiconductor device continues with no apparent end of the process in sight. As a consequence, it is quite likely that critical dimensions will soon be comparable to quantum coherence lengths for the particles involved in the transport within the device. Generally, quantum ...

Within a relativistic real-time Green's function formalism, a quantum transport equation for the phase-space distribution function is derived without a quasi-particle approximation. Dissipation is due to a nonzero spectral width, and can be separated into...

The objective of this research program is to study theoretically the underlying principles of solid-state dynamics and quantum mechanical transport of carriers in ultrasmall novel semiconductor devices. The areas of research are: (1) theory of phonon mode...

... Accession Number : ADA298817. Title : Small Systems: Single Electronics/ Quantum Transport. Descriptive Note : Final rept. 1 Oct 91-30 Sep 94,. ...

The thesis presents an experimental study on transport properties of semiconductor quantum dots. These submicron structures are defined in the two dimensional electron gas (2DEG) of GaAs / AlGaAs heterostructures by means of metallic gates, which are fabr...

This research was theoretical in nature and focused on quantum processes in nanostructures. Specifically we have investigated coherent transport and diffraction through arrays of nanostructures and proposed a new field effect transistor, called the AntiDo...

A relaxation-time ansatz which treats both orbital and spin relaxation in quantum electron transport theory is presented. For orbital relaxation the authors use an ansatz which conserves both charge and spin density, and which is a modification of the tre...

A quantum-mechanical transport equation (QMTE) is derived which should be applicable to a wide range of problems involving the interaction of radiation with atoms or molecules which are also subject to collisions with perturber atoms. The equation follows...

As a method of training new young people in the approaches that have been used, a NATO Advanced Study Institute was held at 11 Ciocco, Lucca, Italy, during 17-30 July 1994, on the subject of Quantum Transport in Ultrasmall Devices. This volume is the proc...

Upcoming heavy ion experiments at the AGS and SPS are aimed at producing and diagnosing a primordial form of matter, the quark-gluon plasma. In these lectures some recent developments on formulating a quantum transport theory for quark-gluon plasmas are introduced. 46 refs.

Upcoming heavy ion experiments at the AGS and SPS are aimed at producing and diagnosing a primordial form of matter, the quark-gluon plasma. In these lectures some recent developments on formulating a quantum transport theory for quark-gluon plasmas are i...

The transport of matter is examined in the context of relativistic quantum transport theory for the case of neutral scalar fields. The goal is to formulate a theory valid off mass shell and out of equilibrium. We construct a conserved moment tensor which ...

This paper shows how the mathematical tools of charged beam transport theory can be applied to classical and quantum optics problems. The theory of optical beam transport in fibres, using Twiss parameters and Courant-Snyder invariants, is discussed. The s...

The Wigner function is a promising method for including such effects as time dependence, self consistency, and inelastic scattering in quantum transport calculations. However, issues regarding the accuracy and consistency of the method need to be resolved...

The time-dependent current flowing through a T-shaped double quantum dot is theoretically studied via nonequilibrium Green's function methods. Quantum coherent ringing or beats can appear in the transient current after a bias voltage is turned on or off, and their periods can be tuned by the pulse bias or the interdot coupling strength. In the weak ...

Quantum teleportation involves the transportation of an unknown quantum state from one location to another, without physical transfer of the information carrier. Although quantum teleportation is a naturally bipartite process, it can be extended to a multipartite protocol known as a quantum ...

Several of the most interesting quantum effects can or could be observed in nanoscopic systems. For example, the effect of strong correlations between electrons and of quantum interference can be measured in transport experiments through quantum dots, wires, individual molecules and rings formed by large molecules ...

... These accomplishments include: development of our Schroedinger Equation Monte Carlo (SEMC) quantum transport simulator into a powerful and ...