We review our work on high-frequency conductance in two-dimensional high-mobility electronic systems in wide n-AlGaAs/GaAs/AlGaAs quantum wells. Using simultaneous measurements of the attenuation and velocity of a surface acoustic wave we obtained both real and imaginary components of the complex high-frequency conductance. Based on the experimental results and their analysis we conclude that close to the filling factor ν = 1/5, as well as in the interval 0.18 > ν > 0.125, a Wigner crystal pinned by disorder is formed. Both the melting temperature and the correlation length of the pinning-induced domains in the Wigner crystal were found. In close vicinities of ν = 1 and 2, transitions from single-electron localization to a Wigner crystal were observed.
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January 2017
Research Article|
January 01 2017
Nature of localized states in two-dimensional electron systems in the quantum Hall regime: Acoustic studies
I. L. Drichko;
I. L. Drichko
A.F. Ioffe Physical-Technical Institute of the Russian Academy of Sciences
, 26 Politekhnicheskaya str., 194021 St. Petersburg, Russia
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I. Yu. Smirnov;
I. Yu. Smirnov
A.F. Ioffe Physical-Technical Institute of the Russian Academy of Sciences
, 26 Politekhnicheskaya str., 194021 St. Petersburg, Russia
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A. V. Suslov;
A. V. Suslov
National High Magnetic Field Laboratory
, Tallahassee, Florida 32310, USA
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Y. M. Galperin;
Y. M. Galperin
a)
Department of Physics,
University of Oslo
, 0316 Oslo, Norway and A.F. Ioffe Physical-Technical Institute of the Russian Academy of Sciences, 26 Politekhnicheskaya str., 194021 St. Petersburg, Russia
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L. N. Pfeiffer;
L. N. Pfeiffer
Department of Electrical Engineering,
Princeton University
, Princeton, New Jersey 08544, USA
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K. W. West
K. W. West
Department of Electrical Engineering,
Princeton University
, Princeton, New Jersey 08544, USA
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a)
E-mail: [email protected]
Low Temp. Phys. 43, 86–94 (2017)
Article history
Received:
July 12 2016
Accepted:
January 17 2017
Citation
I. L. Drichko, I. Yu. Smirnov, A. V. Suslov, Y. M. Galperin, L. N. Pfeiffer, K. W. West; Nature of localized states in two-dimensional electron systems in the quantum Hall regime: Acoustic studies. Low Temp. Phys. 1 January 2017; 43 (1): 86–94. https://doi.org/10.1063/1.4975107
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