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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 21.88: Poster

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

From the Fermi glass towards the Mott insulator in one dimension: Delocalization and strongly enhanced persistent currents [1] — •Dietmar Weinmann¹, Rodolfo A. Jalabert², Jean-Louis Pichard³, and Peter Schmitteckert² — ¹Institut für Physik, Universität Augsburg, D-86135 Augsburg — ²IPCMS, Université Louis Pasteur de Strasbourg, F-67037 Strasbourg — ³CEN Saclay, SPEC, F-91191 Gif-sur-Yvette

When a system of spinless fermions in a disordered mesoscopic ring becomes instable between the inhomogeneous configuration driven by the random potential (Anderson insulator) and the homogeneous one driven by repulsive interactions (Mott insulator), the persistent current can be enhanced by orders of magnitude. This is illustrated by a study of the change of the ground state energy under twisted boundary conditions using the density matrix renormalization group algorithm.

[1] Phys. Rev. Lett. 81, 2308 (1998).