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

I. L. Drichko; I. Yu Smirnov; A. V. Suslov; Y. M. Galperin; L. N. Pfeiffer; K. W. West

doi:10.1063/1.4975107

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

I. L. Drichko, I. Yu Smirnov, A. V. Suslov, Y. M. Galperin, L. N. Pfeiffer, K. W. West

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

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 v=1/5, as well as in the interval 0.18>v>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 v=1 and 2, transitions from single-electron localization to a Wigner crystal were observed.

Original language	English (US)
Pages (from-to)	86-94
Number of pages	9
Journal	Low Temperature Physics
Volume	43
Issue number	1
DOIs	https://doi.org/10.1063/1.4975107
State	Published - Jan 1 2017
Externally published	Yes

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.4975107

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

abstract = "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 v=1/5, as well as in the interval 0.18>v>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 v=1 and 2, transitions from single-electron localization to a Wigner crystal were observed.",

author = "Drichko, {I. L.} and Smirnov, {I. Yu} and Suslov, {A. V.} and Galperin, {Y. M.} and Pfeiffer, {L. N.} and West, {K. W.}",

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T1 - Nature of localized states in two-dimensional electron systems in the quantum Hall regime

T2 - Acoustic studies

AU - Drichko, I. L.

AU - Smirnov, I. Yu

AU - Suslov, A. V.

AU - Galperin, Y. M.

AU - Pfeiffer, L. N.

AU - West, K. W.

PY - 2017/1/1

Y1 - 2017/1/1

N2 - 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 v=1/5, as well as in the interval 0.18>v>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 v=1 and 2, transitions from single-electron localization to a Wigner crystal were observed.

AB - 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 v=1/5, as well as in the interval 0.18>v>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 v=1 and 2, transitions from single-electron localization to a Wigner crystal were observed.

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

Abstract

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