Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2001-05-24
Physica B 296 (2001), 52
Physics
Condensed Matter
Disordered Systems and Neural Networks
4 pages, 4 eps figures, Proc. of the Symposium on Wave Propagation and Electronic Structure in Disordered Systems, FORTH, Hera
Scientific paper
10.1016/S0921-4526(00)00778-X
We numerically simulate the low-energy properties of interacting electrons in a random potential using the Hartree-Fock based exact diagonalization method. In particular, we investigate how the transport properties are influenced by the combined effects of disorder and correlations in the presence of the electron spin. To this end we calculate the participation number of many-particle states in Fock space, the return probability of single-particle excitations, and the Kubo-Greenwood conductance. It turns out that in the strongly localized regime interactions increase the conductance whereas for weak disorder interactions decrease the conductance. In contrast, single-particle excitations in general experience a localizing influence of the interactions.
Epperlein Frank
Kilina Svetlana
Schreiber Michael
Uldanov Sergey
Vojta Thomas
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