Transient magnetoconductivity of photoexcited electrons

Details Transient magnetoconductivity of photoexcited electrons Transient magnetoconductivity of photoexcited electrons

2006-06-21

arxiv.org/abs/cond-mat/0606546v1

Physics

Condensed Matter

Materials Science

21 pages, 6 figs

Scientific paper

10.1103/PhysRevB.74.075309

Transient magnetotransport of two-dimensional electrons with partially-inverted distribution excited by an ultrashort optical pulse is studied theoretically. The time-dependent photoconductivity is calculated for GaAs-based quantum wells by taking into account the relaxation of electron distribution caused by non-elastic electron-phonon interaction and the retardation of the response due to momentum relaxation and due to a finite capacitance of the sample. We predict large-amplitude transient oscillations of the current density and Hall field (Hall oscillations) with frequencies corresponding to magnetoplasmon range, which are initiated by the instability owing to the absolute negative conductivity effect.

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