Regensburg 2000 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 22: Postersitzung III: Supraleitende Anwendungen (1-4) Massive HTSL, Bandleiter, Filme (5-26), Transport in HTSL (27-30), Elektronenstruktur in Supraleitern (31-43), Borkarbide (44-50), Quantenphasen- und Metall-Isolator-Überg
änge (51-69)

TT 22.64: Poster

Donnerstag, 30. März 2000, 14:00–17:30, A

Conductance and Fock space localization of disordered interacting electrons — •Svetlana Kilina, Frank Epperlein, Michael Schreiber, Sergey Uldanov, and Thomas Vojta — Institut für Physik, TU Chemnitz, D-09107 Chemnitz, Germany

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, correlations and the electron spin. To this end we calculate the Kubo-Greenwood conductance, the return probability of single-particle excitations and the participation number of many-particle states in Fock space. It turns out that in the strongly localized regime interactions increase the transport whereas for weak disorder interactions decrease the transport. The delocalizing effect is comparatively weak for short-range interactions but stronger for long-range Coulomb interactions.