The amplitude of non-equilibrium quantum interference in metallic mesoscopic systems
Abstract
We study the influence of a DC bias voltage V on quantum interference corrections to the measured differential conductance in metallic mesoscopic wires and rings. The amplitude of both universal conductance fluctuations (UCF) and Aharonov-Bohm effect (ABE) is enhanced several times for voltages larger than the Thouless energy. The enhancement persists even in the presence of inelastic electron-electron scattering up to V ~ 1 mV. For larger voltages electron-phonon collisions lead to the amplitude decaying as a power law for the UCF and exponentially for the ABE. We obtain good agreement of the experimental data with a model which takes into account the decrease of the electron phase-coherence length due to electron-electron and electron-phonon scattering.
- Publication:
-
EPL (Europhysics Letters)
- Pub Date:
- August 2002
- DOI:
- 10.1209/epl/i2002-00214-6
- arXiv:
- arXiv:cond-mat/0103486
- Bibcode:
- 2002EL.....59..437T
- Keywords:
-
- 73.23.-b;
- 72.10.-d;
- Electronic transport in mesoscopic systems;
- Theory of electronic transport;
- scattering mechanisms;
- Condensed Matter - Mesoscale and Nanoscale Physics
- E-Print:
- New title, refined analysis. 7 pages, 3 figures, to be published in Europhysics Letters