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Evidence for effective mass reduction in GaAs/AlGaAs quantum wells

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.

preprint2013arXivOpen access
A. T. HatkeM. A. ZudovJ. D. WatsonM. J. ManfraL. N. PfeifferK. W. West
cond-mat.mes-hall
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A. T. HatkeM. A. ZudovJ. D. WatsonM. J. ManfraL. N. PfeifferK. W. West

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