Electronic density of states in a long-range correlated potential
- 10 August 1984
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 17 (22) , L559-L564
- https://doi.org/10.1088/0022-3719/17/22/004
Abstract
The density of localised states in the low-energy tail for an electron in a gaussian random potential with long-range spatial correlations is found by evaluating instanton contributions to the n to 0 replica field representation of the one-electron Green function. It is shown that the density of states in the tail crosses over from the form mod E mod d(5-d)/4 exp(-const mod E mod 2-d/2) to the form mod E mod d exp(-const mod E mod 2) when the correlation length exceeds the de Broglie wavelength.Keywords
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