Results 231 to 240 of about 16,365 (265)

Activated Conductivity in the Quantum Hall Effect

Physical Review Letters, 1994
Activated dissipative conductivity ¢==o-*~exp(-A/T) and the activated deviation of the Hall conductivity from the precise quanfizafion &r~v=~--ie2/hf~e xp(--A/T) are studied in a plateau range of the quantum Hall effect. The prefactors cr*~ and o*~ are calculated for the case of a long-range random potential in the fxa~ework of a classical theory ...
, Polyakov, , Shklovskii
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Conductance spectroscopy in coupled quantum dots

Physical Review B, 1994
We investigate the linear-response conductance through a pair of coupled quantum dots. The conductance spectrum under ideal conditions is shown to consist of two sets of twin peaks whose locations and amplitudes are determined by the interdot coupling and the intradot charging.
Klimeck, Gerhard, Chen, Guanlong, Datta, Supriyo   +2 more
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Theory of Quantum Conduction through a Constriction

Physical Review Letters, 1989
A theory of ballistic conduction through a constriction is developed which predicts a steplike structure with amplitude $\frac{{e}^{2}}{h}$ in the conductance as a function of Fermi energy or width. For a sharp (abrupt) constriction the steps are only quantized to 1 part in ${10}^{3}$ at $T=0$.
, Szafer, , Stone
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Nonuniversal Conductance Quantization in Quantum Wires

Physical Review Letters, 1996
We have measured the transport properties of high-quality quantum wires fabricated in GaAs-AlGaAs by using cleaved edge overgrowth. The low temperature conductance is quantized as the electron density in the wire is varied. While the values of the conductance plateaus are reproducible, they deviate from multiples of the universal value of ${2e}^{2}/h ...
, Yacoby, , Stormer, , Wingreen, , Pfeiffer, , Baldwin, , West   +5 more
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Statistics of conductance fluctuations in quantum dots

Physical Review Letters, 1993
We present a complete analytical theory of conductance fluctuations in quantum dots in the regime of chaotic dynamics. Using the supersymmetry method we calculate for the first time exactly the conductance distribution function for a system of noninteracting electrons.
, Prigodin, , Efetov, , Iida
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Resonant conduction in ballistic quantum channels

Physical Review B, 1989
The conductance of a short, narrow ballistic constriction in a two-dimensional electron gas in a semiconductor heterostructure is calculated exactly for a simple but plausible model. A novel phenomenon is predicted: Such quantum channels should exhibit resonant conduction in highmobility samples at low temperatures.
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Quantum electronic conductance of a terminal junction

Physical Review Letters, 1989
We rigorously treat the quantum mechanical propagation of a two-dimensional electron gas through multiterminal junctions. The elements ${R}_{\mathrm{mn}}$,kl of B\"uttiker's global resistance tensor are calculated for ballistic motion. Our results confirm the occurrence of negative resistance observed in recent experiments and predict oscillations of ...
, Avishai, , Band
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Quantum conductance of carbon nanotubes with defects

Physical Review B, 1996
We study the conductance of metallic carbon nanotubes with vacancies and pentagon-heptagon pair defects within the Landauer formalism. Using a tight-binding model and a Green's function technique to calculate the scattering matrix, we examine the one-dimensional to two-dimensional crossover in these systems and show the existence of metallic tube ...
, Chico, , Benedict, , Louie, , Cohen
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Dynamical conductivity of a quantum-wire superlattice

Physical Review B, 1989
The dynamical current response of a multiple-quantum-wire superlattice to a time-oscillatory external electric field is examined using Kubo's linear-response theory. Couplings of the quasi-one-dimensional electron gases with phonons (polar optic, and acoustic deformation potential) are discussed to lowest order in terms of a current-current correlation
, Cui, , Horing
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Quantum Effects on the Conductivity of a Dense Plasma

The Physics of Fluids, 1964
The collective properties of a plasma, in its interaction with a radiation field, become important when the electron plasma frequency is comparable with, or exceeds, the radiation frequency. The particle interactions must properly be treated quantum mechanically when electron plasma wave phonon energies are of the order of, or greater than, average ...
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