Evidence for effective mass reduction in GaAs/AlGaAs quantum wells

A. T. Hatke, University of Minnesota - Twin Cities
M. A. Zudov, University of Minnesota - Twin Cities
J. D. Watson, Birck Nanotechnology Center, Purdue University
Michael J. Manfra, Birck Nanotechnology Center, Purdue University
L. N. Pfeiffer, Princeton University
K. W. West, Princeton University

Date of this Version

4-26-2013

Comments

This is the published version of A. T. Hatke, M. A. Zudov, J. D. Watson, M. J. Manfra, L. N. Pfeiffer, and K. W. West. 26 April 2013. Evidence for effective mass reduction in GaAs/AlGaAs quantum wells. First published in the Physical Review B and is available online at: http://dx.doi.org/10.1103/PhysRevB.87.161307.

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, m(b)*. 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 m(b)*, in accord with previous studies. DOI: 10.1103/PhysRevB.87.161307

Discipline(s)

Nanoscience and Nanotechnology

 

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