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Negative compressibility of interacting two-dimensional electron and quasiparticle gases

Eisenstein, J. P. and Pfeiffer, L. N. and West, K. W. (1992) Negative compressibility of interacting two-dimensional electron and quasiparticle gases. Physical Review Letters, 68 (5). pp. 674-677. ISSN 0031-9007. http://resolver.caltech.edu/CaltechAUTHORS:EISprl92a

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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, ν<1, are reported. A new method is used to determine both the magnitude and sign 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 ν=0 and 1. Compressibility features near the fractional fillings ν=1/3 and 2/3 give thermodynamic evidence for dilute interacting quasiparticle gases.


Item Type:Article
Additional Information:©1992 The American Physical Society Received 26 September 1991 It is a sincere pleasure to thank A. L. Efros, T. J. Gramila, J. Hu, M. Hybersten, and R. L. Willett fpr fruitful discussions. We are indebted to A. H. MacDonald for discussions, explanations, and general encouragement.
Record Number:CaltechAUTHORS:EISprl92a
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:EISprl92a
Alternative URL:http://dx.doi.org/10.1103/PhysRevLett.68.674
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:4033
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:25 Jul 2006
Last Modified:26 Dec 2012 08:57

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