Peculiarities of the controlled dephasing of a quantum dot in the Kondo regime
Department of Condensed Matter Physics, The Weizmann Institute of
Science 76100 Rehovot, Israel
Accepted: 20 January 2003
In this work we analyze how coherent transport through a quantum dot (QD) in the Kondo regime is affected by the weak capacitive interaction with a nearby biased quantum point contact (QPC). We find that when the QD-QPC interaction is weak, the width of the resonance at the Fermi level is hardly affected by it, suggesting the absence of dephasing. However, the spectral weight of such resonance is reduced leading to an observable suppression of the conductance and the elastic transmission probability through the QD.
PACS: 75.20.Hr – Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions / 73.23.-b – Electronic transport in mesoscopic systems / 03.65.Yz – Decoherence; open systems; quantum statistical methods
© EDP Sciences, 2003