Phys. Rev. Lett. 88, 086401 (2002) [4 pages]Droplet State and the Compressibility Anomaly in Dilute 2D Electron SystemsReceived 22 March 2001; published 6 February 2002 We investigate the space distribution of carrier density and the compressibility of two-dimensional (2D) electron systems by using the local density approximation. The strong correlation is simulated by the local exchange and correlation energies. A slowly varied disorder potential is applied to simulate the disorder effect. We show that the compressibility anomaly observed in 2D systems which accompanies the metal-insulator transition can be attributed to the formation of the droplet state due to a disorder effect at low carrier densities. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.88.086401
DOI:
10.1103/PhysRevLett.88.086401
PACS:
71.30.+h, 73.21.-b
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