Anomalous sound propagation at =1/2 in a 2D electron gas: Observation of a spontaneously broken translational symmetry?

R. L. Willett, M. A. Paalanen, R. R. Ruel, K. W. West, L. N. Pfeiffer, D. J. Bishop

Research output: Contribution to journalArticlepeer-review

249 Scopus citations

Abstract

Surface-acoustic-wave propagation on high-quality AlGaAs/GaAs heterostructures containing a two-dimensional electron system has been examined in the fractional quantum Hall effect (FQHE) regime. The response of the electron system to the sound wave is found to be similar in the FQHE states to that previously studied in the integral quantum Hall states. However, a striking disparity is observed at Landau-level filling =1/2, where sound propagation is distinctly different from that in the neighboring filling-factor range. We propose that phase separation of the 2DEG may be responsible for the feature at =1/2.

Original languageEnglish (US)
Pages (from-to)112-115
Number of pages4
JournalPhysical review letters
Volume65
Issue number1
DOIs
StatePublished - 1990
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

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