Europhys. Lett.
Volume 63, Number 3, August 2003
Page(s) 426 - 432
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 01 November 2003
DOI: 10.1209/epl/i2003-00537-2
Europhys. Lett., 63 (3) , pp. 426-432 (2003)

Interaction-induced quantum dephasing in mesoscopic rings

D. S. Golubev1, 2, C. P. Herrero3 and A. D. Zaikin4, 2

1  Institut für Theoretische Festkörperphysik, Universität Karlsruhe D-76128 Karlsruhe, Germany
2  I. E. Tamm Department of Theoretical Physics, P. N. Lebedev Physics Institute 119991 Moscow, Russia
3  Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco E-28049 Madrid, Spain
4  Forschungszentrum Karlsruhe, Institut für Nanotechnologie D-76021 Karlsruhe, Germany

(Received 22 January 2003; accepted 2 June 2003)

Combining nonperturbative techniques with Monte Carlo simulations, we demonstrate that quantum coherence effects for a particle on a ring are suppressed beyond a finite length $L_{\varphi}$ even at zero temperature if the particle is coupled to a diffusive electron gas by means of long-range Coulomb interaction. This length is consistent with $L_{\varphi}$ derived from a weak-localization-type analysis.

73.23.Ra - Persistent currents.
72.10.-d - Theory of electronic transport; scattering mechanisms.
71.10.-w - Theories and models of many-electron systems.

© EDP Sciences 2003