Effect of electron-electron scattering on magnetointersubband resistance oscillations of two-dimensional electrons in GaAs quantum wells

Abstract

The low-temperature($4.2<T<12.5$ K) magnetotransport ($B<2$ T) of two-dimensional electrons occupying two subbands (with energy $E_1$ and $E_2$) is investigated in GaAs single quantum well with AlAs/GaAs superlattice barriers. Two series of Shubnikov-de Haas oscillations are found to be accompanied by magnetointersubband (MIS) oscillations, periodic in the inverse magnetic field. The period of the MIS oscillations obeys condition ${\Delta }_{12}=(E_2-E_1)=k\cdot \hslash {\omega }_c$, where ${\Delta }_{12}$ is the subband energy separation, ${\omega }_c$ is the cyclotron frequency, and $k$ is the positive integer. At $T$=4.2 K the oscillations manifest themselves up to $k$=100. Strong temperature suppression of the magnetointersubband oscillations is observed. We show that the suppression is a result of electron-electron scattering. Our results are in good agreement with recent experiments, indicating that the sensitivity to electron-electron interaction is the fundamental property of magnetoresistance oscillations, originating from the second-order Dingle factor.

6 pages, 4 figures

References in corpus (3)

• Temperature Dependence of Microwave Photoresistance in 2D Electron Systems
• Role of electron-electron interactions in nonlinear transport in 2D electron systems
• Resonance oscillations of magnetoresistance in double quantum wells

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