Quantum Coulomb glass - Hartree-Fock approximation versus exact diagonalization

Details Quantum Coulomb glass - Hartree-Fock approximation versus exact diagonalization Quantum Coulomb glass - Hartree-Fock approximation versus exact diagonalization

1997-08-25

arxiv.org/abs/cond-mat/9708193v1

phys. stat. sol (b) 205, 233 (1998)

Physics

Condensed Matter

Disordered Systems and Neural Networks

3 pages RevTeX, 2 figures, to appear in Proc. VII Int. Conf. on Hopping and Related Phenomena

Scientific paper

We investigate the behavior of disordered interacting electrons in the insulating regime. Our study is based on the quantum Coulomb glass model which is obtained from the classical Coulomb glass by adding hopping matrix elements between neighboring sites. We use two different numerical methods, viz. a Hartree-Fock approximation and an exact diagonalization and compare the results for the tunneling density of states and the localization properties in order to determine the range of validity of the Hartree-Fock method. We find that the Hartree-Fock method gives a good approximation for the density of states for all energies but represents the localization properties correctly close to the Fermi level only. Some consequences for the localization of disordered interacting electrons are discussed.

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