Negative compressibility of interacting two-dimensional electron and quasiparticle gases

J. P. Eisenstein, L. N. Pfeiffer, K. W. West

Research output: Contribution to journalArticlepeer-review

313 Scopus citations

Abstract

Direct measurements of the compressibility K of the 2D electron gas at both zero magnetic field B and in the high-field extreme quantum limit, <1, are reported. A new method is used to determine both the magnitude and IsignR of K. At B=0 we find K-1 changes sign and becomes negative as the 2D density is reduced. At high B, K-1 exhibits negative anomalies near both =0 and 1. Compressibility features near the fractional fillings =1/3 and 2/3 give thermodynamic evidence for dilute interacting quasiparticle gases.

Original languageEnglish (US)
Pages (from-to)674-677
Number of pages4
JournalPhysical review letters
Volume68
Issue number5
DOIs
StatePublished - 1992
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

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