Gradient Corrections in the Exchange and Correlation Energy of an Inhomogeneous Electron Gas
- 3 November 1975
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 35 (18), 1234-1237
- https://doi.org/10.1103/physrevlett.35.1234
Abstract
An exact result is derived for the coefficient which determines the first gradient corrections to the exchange and correlation energy of an inhomogeneous electron gas. A method of approximation, which is based on the random-phase approximation and is exact at high density, is given for the explicit evaluation of . Numerical results are also given for the metallic density range and applications are discussed.
Keywords
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