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.
@article{arxiv.cond-mat/9910434,
title = {Electronic Dephasing in the Quantum Hall Regime},
author = {N. A. Fromer and C. Schüller and D. S. Chemla and T. V. Shahbazyan and I. E. Perakis and K. Maranowski and A. C. Gossard},
journal= {arXiv preprint arXiv:cond-mat/9910434},
year = {2009}
}
Comments
10 pages including 3 figs. To appear in Phys. Rev. Lett