Low Temperature Physics: 43, 86 (2017); https://doi.org/10.1063/1.4975107
Fizika Nizkikh Temperatur: Volume 43, Number 1 (January 2017), p. 104-114    ( to contents , go back )

Nature of localized states in two-dimensional electron systems in the quantum Hall regime: Acoustic studies

I.L. Drichko1, I.Yu. Smirnov1, A.V. Suslov2,Y.M. Galperin3,1, L.N. Pfeiffer4, K.W. West4

1Ioffe Physical-Technical Institute, St. Petersburg 194021, Russia

2National High Magnetic Field Laboratory, Tallahassee, FL 32310, USA

3Department of Physics, University of Oslo, 0316 Oslo, Norway
E-mail: iouri.galperine@fys.uio.no

4Department of Electrical Engineering, Princeton University, Princeton, NJ 08544, USA
pos Анотація:

Received Jule 12, 2016


We review our work on studies of 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 have found 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 are found. In close vicinities of ν = 1 and 2 transitions from single-electron localization to a Wigner crystal were observed.

PACS: 73.23.–b Electronic transport in mesoscopic systems;
PACS: 73.50.Rb Acoustoelectric and magnetoacoustic effects;
PACS: 73.43.Qt Magnetoresistance.

Key words: two-dimensional electron gas, high-frequency transport.

Published online: November 25, 2016

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