Münster 1999 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 21: Postersitzung III: Hochfrequenzeigenschaften (1-4), Amorphe Systeme (5-9), Borkarbide (10-18), Quantenflüssigkeiten (19-25), Dünne Filme (26-49), Vortexdynamik, Pinning (50-63), M-I-Überg
änge, quantenkritische Ph
änomene (64-89)

TT 21.87: Poster

Donnerstag, 25. März 1999, 14:30–18:00, Foy

Do interactions increase or reduce the conductance of disordered electrons? It depends! — •F. Epperlein, M. Schreiber, and Thomas Vojta — Institut für Physik, Technische Universität, D-09107 Chemnitz

We investigate the influence of electron-electron interactions on the conductance of disordered spinless electrons. In order to determine with high accuracy the low-energy properties in the entire parameter space we use an efficient numerical method, the Hartree-Fock based diagonalization, which works in a truncated basis of Hartree-Fock states. We find that weak interactions increase the d.c. conductance in the strongly localized regime while they decrease the d.c. conductance for weak disorder. Strong interactions always decrease the conductance. We also study the transport properties of single-particle excitations which determine the conductance of a mesoscopic interacting sample connected to non-interacting leads.
T. Vojta, F. Epperlein, and M. Schreiber, Phys. Rev. Lett. 81, 4212 (1998)