AMPLITUDE OF AHARONOV-BOHM OSCILLATIONS IN MESOSCOPIC METALLIC RINGS AS A FUNCTION OF THE DC BIAS VOLTAGE
We report measurements of the amplitude of the Aharonov-Bohmoscillations in a mesoscopic diusive gold ring as a function of the DC bias voltageVDC.Theamplitudeoftheh=eoscillationsincreases withVDConce the Thouless energyEcand thermal energy are exceeded, and decreases at higher values ofVDC. The increase of the amplitude is interpreted in terms of a superposition of the statistically independent contributions ofeVDC=Ecenergy intervals,whereas its decrease at high VDCcould be attributed to enhanced inelastic scattering processes.