A theory for the width of the Coulomb gap
- 30 September 1985
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 18 (27) , 5325-5334
- https://doi.org/10.1088/0022-3719/18/27/018
Abstract
The results of two different calculations of the mean width Eg of the Coulomb gap are presented. The calculations are performed for the 'lattice model' used by Efros and Shklovskii (1975) in which the fractional site occupation K and the disorder energy W0 are parameters which may be varied independently. The authors determine approximations to the ground state first by stabilising the system against single-electron transfers, and second by direct minimisation of the total energy. Eg is found to depend on W0 as Eg varies as Ec((Ec/W0+Ec))1(d-1)/ where d is the dimensionality, and is either two or three. The dependence on K of Eg differs slightly for the two methods.Keywords
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