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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.

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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.

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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.
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Deposited On:25 Jul 2006
Last Modified:18 Sep 2014 18:11

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