Electronic Dephasing in the Quantum Hall Regime

Details Electronic Dephasing in the Quantum Hall Regime Electronic Dephasing in the Quantum Hall Regime

1999-10-26

arxiv.org/abs/cond-mat/9910434v1

Phys. Rev. Lett. 83, 4646 (1999)

Physics

Condensed Matter

10 pages including 3 figs. To appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.83.4646

By means of degenerate four-wave mixing (FWM), we investigate the quantum coherence of electron-hole pairs in the presence of a two-dimensional electron gas in modulation-doped GaAs-AlGaAs quantum wells in the quantum Hall effect regime. With increasing magnetic field, we observe a crossover from Markovian to non-Markovian behavior, as well as large jumps in the decay time of the FWM signal at even Landau level filling factors. The main observations can be qualitatively reproduced by a model which takes into account scattering by the collective excitations of the two-dimensional electron gas.

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