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Dephasing in the presence of a two-dimensional electron gas at high magnetic fields

Fromer, N. A. ; Schüller, Christian ; Chemla, D. S. ; Maranowski, K. ; Gossard, A. C.



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 regime of the integer quantum-Hall effect. We observe large jumps in the decay time of the FWM signal at even Landau level filling factors. The main features of the experimental ...

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