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Localization and conductance in the quantum Coulomb glass
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.Comment: Contribution to the Festschrift dedicated to Prof. Michael Pollak on
the occasion of his 75th birthda
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