Phys. Rev. Lett. 68, 674–677 (1992)Negative compressibility of interacting two-dimensional electron and quasiparticle gasesReceived 26 September 1991; published in the issue dated 3 February 1992 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 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 ν=0 and 1. Compressibility features near the fractional fillings ν=1/3 and 2/3 give thermodynamic evidence for dilute interacting quasiparticle gases. © 1992 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.68.674
DOI:
10.1103/PhysRevLett.68.674
PACS:
73.20.-r
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