Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-01-31
Phys. Rev. B 77, 205309 (2008)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
7 pages, 5 figures, published version
Scientific paper
10.1103/PhysRevB.77.205309
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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