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arXiv · 1305.1814

Evidence for effective mass reduction in GaAs/AlGaAs quantum wells

A. T. Hatke·M. A. Zudov·J. D. Watson·M. J. Manfra·L. N. Pfeiffer·K. W. West
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Abstract

We have performed microwave photoresistance measurements in high mobility GaAs/AlGaAs quantum wells and investigated the value of the effective mass. Surprisingly, the effective mass, obtained from the period of microwave-induced resistance oscillations, is found to be about 12% lower than the band mass in GaAs, $\mb$. This finding provides strong evidence for electron-electron interactions which can be probed by microwave photoresistance in very high Landau levels. In contrast, the measured magnetoplasmon dispersion revealed an effective mass which is close to $\mb$, in accord with previous studies.

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A. T. Hatke, M. A. Zudov, J. D. Watson, M. J. Manfra, L. N. Pfeiffer, K. W. West. 2013-05-08. Evidence for effective mass reduction in GaAs/AlGaAs quantum wells. https://doi.org/10.1103/physrevb.87.161307

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