The Amplitude of Non-Equilibrium Quantum Interference in Metallic Mesoscopic Systems

Details The Amplitude of Non-Equilibrium Quantum Interference in Metallic Mesoscopic Systems The Amplitude of Non-Equilibrium Quantum Interference in Metallic Mesoscopic Systems

2001-03-23

arxiv.org/abs/cond-mat/0103486v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

New title, refined analysis. 7 pages, 3 figures, to be published in Europhysics Letters

Scientific paper

10.1209/epl/i2002-00214-6

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.

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