Phase of phonon-induced resistance oscillations in a high-mobility two-dimensional electron gas

Details Phase of phonon-induced resistance oscillations in a high-mobility two-dimensional electron gas Phase of phonon-induced resistance oscillations in a high-mobility two-dimensional electron gas

2011-12-20

arxiv.org/abs/1112.4766v1

Physical Review B - Rapid Communications 84, 121301(R) (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevB.84.121301

We report on experimental studies of magnetoresistance oscillations that originate from the resonant interaction of two-dimensional electrons with thermal transverse-acoustic phonons in very high-mobility GaAs/AlGaAs quantum wells. We find that the oscillation maxima consistently occur when a frequency of a phonon with twice the Fermi momentum exceeds an integer multiple of the cyclotron frequency. This observation is in contrast to to all previous experiments associating resistance maxima with magnetophonon resonance and its harmonics. Our experimentally obtained resonant condition is in excellent quantitative agreement with recent theoretical proposals.

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