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Author |
Shah, Jagdeep; Pinczuk, A.; Gossard, A. C.; Wiegmann, W. |
Title |
Energy-loss rates for hot electrons and holes in GaAs quantum wells |
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Journal Article |
Year |
1985 |
Publication |
Phys. Rev. Lett. |
Abbreviated Journal |
Phys. Rev. Lett. |
Volume |
54 |
Issue |
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Pages |
2045-2048 |
Keywords |
2DEG, GaAs/AlGaAs, heat flow, electron-phonon, hole-phonon, carrier-phonon, interactions |
Abstract |
We report the first direct determination of carrier-energy-loss rates in a semiconductor. These measurements provide fundamental insight into carrier-phonon interactions in semiconductors. Unexpectedly large differences are found in the energy-loss rates for electrons and holes in GaAs/AlGaAs quantum wells. This large difference results from an anomalously low electron-energy-loss rate, which we attribute to the presence of nonequilibrium optical phonons rather than the effects of reduced dimensionality or dynamic screening. |
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Author |
Shah, Nayana; Pekker, David; Goldbart, Paul M. |
Title |
Inherent stochasticity of superconductor-resistor switching behavior in nanowires |
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Journal Article |
Year |
2008 |
Publication |
Phys. Rev. Lett. |
Abbreviated Journal |
Phys. Rev. Lett. |
Volume |
101 |
Issue |
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Pages |
207001(1 to 4) |
Keywords |
superconducting nanowires, phase-slip, self-heating effect, temperature profile |
Abstract |
We study the stochastic dynamics of superconductive-resistive switching in hysteretic current-biased superconducting nanowires undergoing phase-slip fluctuations. We evaluate the mean switching time using the master-equation formalism, and hence obtain the distribution of switching currents. We find that as the temperature is reduced this distribution initially broadens; only at lower temperatures does it show the narrowing with cooling naively expected for phase slips that are thermally activated. We also find that although several phase-slip events are generally necessary to induce switching, there is an experimentally accessible regime of temperatures and currents for which just one single phase-slip event is sufficient to induce switching, via the local heating it causes. |
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919 |
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Author |
Bremer, J. W.; Newhouse, V. L. |
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Journal Article |
Year |
1958 |
Publication |
Phys. Rev. Lett. |
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1 |
Issue |
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Pages |
282 |
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Bremer, J. W.; Newhouse, V. L. |
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MSPU @ s @ bremer_prl_1958 |
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215 |
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