Ground-state energy and compressibility of a disordered two-dimensional electron gas

Date
2007
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Source Title
International Journal of Modern Physics B
Print ISSN
0217-9792
Electronic ISSN
Publisher
World Scientific Publishing
Volume
21
Issue
13-14
Pages
2134 - 2144
Language
English
Type
Conference Paper
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Abstract

Two-dimensional (2D) electron systems in the presence of disorder are of interest in connection with the observed metal-insulator transition in such systems. We use density functional theory in its local-spin density approximation (LSDA) to calculate the ground-state energy of a 2D electron system in the presence of remote charged impurities which up on averaging provides disorder. The inverse compressibility calculated from the ground-state energy exhibits a minimum at a critical density controlled by the disorder strength. Our findings are in agreement with experimental results.

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Keywords
2D electron gas, Compressibility, Disorder effects
Citation
Published Version (Please cite this version)