Magneto-oscillations due to electron-electron interactions in the ac conductivity of a two-dimensional electron gas.
Electron-electron interactions give rise to the correction, deltasigma(int)(omega), to the ac magnetoconductivity, sigma(omega), of a clean 2D electron gas that is periodic in omega_(c)(-1), where omega_(c) is the cyclotron frequency. Unlike conventional harmonics of the cyclotron resonance, which are periodic with omega, this correction is periodic with omega(3/2). Oscillations in deltasigma(int)(omega) develop at low magnetic fields, omega_(c)<<omega, when the conventional harmonics are suppressed by the disorder. Their origin is a double backscattering of an electron from the impurity-induced Friedel oscillations. During the time approximately omega(-1) between the two backscattering events the electron travels only a small portion of the Larmour circle.
Sedrakyan
T A
TA
Department of Physics, University of Utah, Salt Lake City, Utah 84112, USA.
Raikh
M E
ME