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Title: High-frequency conductivity in the fractional quantum Hall regime

Abstract

In this paper surface acoustic wave (SAW) propagation on high quality AlGaAs/GaAs heterostructures is examined in the fractional quantum Hall regime. By measuring the transmitted SAW amplitude and frequency the 2D electron system (2DES) conductivity at the SAW frequency can be deduced and compared to the measured d.c. conductivity. Up to about 500 MHz the SAW derived conductivity does not differ substantially from the measured d.c. conductivity. At higher frequencies some deviations are observed at FQHE and IQHE states. However, at Landau level filling {nu} = 1/2 SAW propagation is markedly different from that observed in the neighboring filling factor range; the response to the SAW is the opposite of that suggested by the d.c. conductivity. In addition, anomalous sound propagation is also observed in the small filling factor range {nu} {approx lt} 1/5, where electron solid formation is suspected. The properties of these distinct SAW anomalies are described and their possible origins discussed.

Authors:
; ; ; ;  [1]
  1. AT and T Bell Lab., Murray Hill, NJ (US)
Publication Date:
OSTI Identifier:
5328554
Resource Type:
Journal Article
Journal Name:
International Journal of Modern Physics B; (United States)
Additional Journal Information:
Journal Volume: 6:5; Journal ID: ISSN 0217-9792
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM ARSENIDES; HALL EFFECT; GALLIUM ARSENIDES; AMPLITUDES; FREQUENCY DEPENDENCE; HETEROJUNCTIONS; MHZ RANGE 100-1000; QUANTIZATION; SURFACE PROPERTIES; ALUMINIUM COMPOUNDS; ARSENIC COMPOUNDS; ARSENIDES; FREQUENCY RANGE; GALLIUM COMPOUNDS; JUNCTIONS; MHZ RANGE; PNICTIDES; SEMICONDUCTOR JUNCTIONS; 360606* - Other Materials- Physical Properties- (1992-)

Citation Formats

Willet, R L, Paalanen, M A, Pfeiffer, L N, West, K W, and Ruel, R R. High-frequency conductivity in the fractional quantum Hall regime. United States: N. p., 1992. Web. doi:10.1142/S0217979292000487.
Willet, R L, Paalanen, M A, Pfeiffer, L N, West, K W, & Ruel, R R. High-frequency conductivity in the fractional quantum Hall regime. United States. https://doi.org/10.1142/S0217979292000487
Willet, R L, Paalanen, M A, Pfeiffer, L N, West, K W, and Ruel, R R. 1992. "High-frequency conductivity in the fractional quantum Hall regime". United States. https://doi.org/10.1142/S0217979292000487.
@article{osti_5328554,
title = {High-frequency conductivity in the fractional quantum Hall regime},
author = {Willet, R L and Paalanen, M A and Pfeiffer, L N and West, K W and Ruel, R R},
abstractNote = {In this paper surface acoustic wave (SAW) propagation on high quality AlGaAs/GaAs heterostructures is examined in the fractional quantum Hall regime. By measuring the transmitted SAW amplitude and frequency the 2D electron system (2DES) conductivity at the SAW frequency can be deduced and compared to the measured d.c. conductivity. Up to about 500 MHz the SAW derived conductivity does not differ substantially from the measured d.c. conductivity. At higher frequencies some deviations are observed at FQHE and IQHE states. However, at Landau level filling {nu} = 1/2 SAW propagation is markedly different from that observed in the neighboring filling factor range; the response to the SAW is the opposite of that suggested by the d.c. conductivity. In addition, anomalous sound propagation is also observed in the small filling factor range {nu} {approx lt} 1/5, where electron solid formation is suspected. The properties of these distinct SAW anomalies are described and their possible origins discussed.},
doi = {10.1142/S0217979292000487},
url = {https://www.osti.gov/biblio/5328554}, journal = {International Journal of Modern Physics B; (United States)},
issn = {0217-9792},
number = ,
volume = 6:5,
place = {United States},
year = {Sun Mar 01 00:00:00 EST 1992},
month = {Sun Mar 01 00:00:00 EST 1992}
}