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 language | English (US) |
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Pages (from-to) | 674-677 |
Number of pages | 4 |
Journal | Physical review letters |
Volume | 68 |
Issue number | 5 |
DOIs | |
State | Published - 1992 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy