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Electronic Dephasing in the Quantum Hall Regime

N. A. Fromer·C. Schüller·D. S. Chemla·T. V. Shahbazyan·I. E. Perakis·K. Maranowski·A. C. Gossard
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Abstract

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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N. A. Fromer, C. Schüller, D. S. Chemla, T. V. Shahbazyan, I. E. Perakis, K. Maranowski, A. C. Gossard. 1999-10-26. Electronic Dephasing in the Quantum Hall Regime. https://doi.org/10.1103/physrevlett.83.4646

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