Localization and conductance in the quantum Coulomb glass

Details Localization and conductance in the quantum Coulomb glass Localization and conductance in the quantum Coulomb glass

2001-09-28

arxiv.org/abs/cond-mat/0109551v1

Phil. Mag. B 81, 1117 (2001)

Physics

Condensed Matter

Disordered Systems and Neural Networks

Contribution to the Festschrift dedicated to Prof. Michael Pollak on the occasion of his 75th birthday

Scientific paper

10.1080/13642810110055724

We consider the combined influence of disorder, electron-electron interactions and quantum hopping on the properties of electronic systems in a localized phase, approaching an insulator-metal transition. The generic models in this regime are the quantum Coulomb glass and its generalization to electrons with spin. After introducing these models we explain our computational method, the Hartree-Fock based diagonalization. We then discuss the conductance and compare spinless fermions and electrons. It turns out that spin degrees of freedom do not play an essential role in the systems considered. Finally, we analyze localization and decay of single-particle excitations. We find that interactions generically tend to localize these excitations which is a result of the Coulomb gap in the single-particle density of states.

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