Phonon-induced resistance oscillations of two-dimensional electron systems drifting with supersonic velocities
Abstract
We present a theory of the phonon-assisted nonlinear dc transport of 2D electrons in high Landau levels. The nonlinear dissipative resistivity displays quantum magneto-oscillations governed by two parameters which are proportional to the Hall drift velocity vH of electrons in electric field and the speed of sound s. In the subsonic regime, vH<s, the theory quantitatively reproduces the oscillation pattern observed in recent experiments. We also find the π/2 phase change of oscillations across the sound barrier vH=s. In the supersonic regime, vH>s, the amplitude of oscillations saturates with lowering temperature, while the subsonic region displays exponential suppression of the phonon-assisted oscillations with temperature.
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