The amplitude of non-equilibrium quantum interference in metallic mesoscopic systems
Institute of Physics, University of Basel - Klingelbergstrasse 82
CH-4056 Basel, Switzerland
Accepted: 2 May 2002
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 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.
PACS: 73.23.-b – Electronic transport in mesoscopic systems / 72.10.-d – Theory of electronic transport; scattering mechanisms
© EDP Sciences, 2002