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

Abstract

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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Cited by in corpus (11)

• Nonequilibrium phenomena in high Landau levels
• Giant negative magnetoresistance in high-mobility 2D electron systems
• Colossal negative magnetoresistance in a 2D electron gas
• Multiphoton microwave photoresistance in a high-mobility two-dimensional electron gas
• The photoresponse of a two-dimensional electron gas at the second harmonic of the cyclotron resonance
• Microwave photoresistance in a two-dimensional electron gas with separated Landau levels
• Microwave Photoresistance in an Ultrahigh Quality GaAs Quantum Well
• Nonlinear response in overlapping and separated Landau levels of GaAs quantum wells
• Microwave-induced zero-resistance" states and second-harmonic generation in an ultraclean two-dimensional electron gas
• Magnetophonon oscillations of thermoelectric power and combined resonance in two-subband electron systems
• Oscillatory photoresistance on the high field side of the cyclotron resonance