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arXiv 0704.1704cond-mat.mes-hall
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二维电子气交流电导中电子-电子相互作用引起的磁振荡

Magneto-oscillations due to electron-electron interactions in the ac conductivity of a 2D electron gas

T. A. Sedrakyan, M. E. Raikh

摘要:

电子-电子相互作用引起了对干净的二维电子气的交流磁导率σ(ω)的修正δσ^{int}(ω),其在ω_c^{-1}中是周期性的,其中ω_c是回旋频率。与回旋加速器共振的常规谐波不同,其以ω为周期,该校正以ω^{3/2}为周期。当常规谐波被无序抑制时,δσ^{int}(ω)的振荡在低磁场ω_c \ll ω下发展。它们的起源是一个{ \em双}背散射的电子从杂质诱导的弗里德尔振荡。在两个反向散射事件之间的时间\sim ω^{-1}期间,电子仅行进拉莫尔圆的{ \em小部分}。

英文摘要:

Electron-electron interactions give rise to the correction, δσ^{int}(ω), to the ac magnetoconductivity, σ(ω), of a clean 2D electron gas that is periodic in ω_c^{-1}, where ω_c is the cyclotron frequency. Unlike conventional harmonics of the cyclotron resonance, which are periodic with ω, this correction is periodic with ω^{3/2}. Oscillations in δσ^{int}(ω) develop at low magnetic fields, ω_c\llω, when the conventional harmonics are suppressed by the disorder. Their origin is a {\em double} backscattering of an electron from the impurity-induced Friedel oscillations. During the time \simω^{-1} between the two backscattering events the electron travels only a {\em small portion} of the Larmour circle.

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