Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-04-13
Phys. Rev. Lett. 100, 086808 (2008)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4+ pages, 3 figures
Scientific paper
10.1103/PhysRevLett.100.086808
Electron-electron interactions give rise to the correction, \delta\sigma^{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 \delta\sigma^{int}(\omega) develop at low magnetic fields, \omega_c\ll\omega, 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 \sim\omega^{-1} between the two backscattering events the electron travels only a {\em small portion} of the Larmour circle.
Raikh Mikhail E.
Sedrakyan Tigran A.
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