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arXiv · 0801.4836

Low temperature electron-phonon resonance in dc-current-biased two-dimensional electron systems

X. L. Lei
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Abstract

Effects of resonant acoustic phonon scattering on magnetoresistivity are examined in two-dimensional electron systems at low temperatures by using a balance-equation magnetotransport scheme direct controlled by the current. The experimentally observed resonances in linear resistivity are shown to result from the conventional bulk phonon modes in a GaAs-based system, without invoking leaky interface phonons. Due to quick heating of electrons, phonon resonances can be dramatically enhanced by a finite bias current. When the electron drift velocity increases to the speed of sound, additional and prominent phonon resonance peaks begin to emerge. As a result, remarkable resistance oscillation and negative differential resistivity can appear in nonlinear transport in a modest mobility sample at low temperatures, which is in agreement with recent experiments.

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X. L. Lei. 2008-05-13. Low temperature electron-phonon resonance in dc-current-biased two-dimensional electron systems. https://doi.org/10.1103/physrevb.77.205309

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