Noise-induced phase transition in the electronic Mach-Zehnder interferometer
Mesoscale and Nanoscale Physics
2009-07-16 v1 Strongly Correlated Electrons
Abstract
We consider dephasing in the electronic Mach-Zehnder interferometer strongly coupled to current noise created by a voltage biased quantum point contact (QPC). We find the visibility of Aharonov-Bohm oscillations as a function voltage bias and express it via the cumulant generating function of noise. In the large-bias regime, high-order cumulants of current add up to cancel the dilution effect of a QPC. This leads to an abrupt change in the dependence of the visibility on voltage bias which occurs at the QPC's transparency T=1/2. Quantum fluctuations in the vicinity of this point smear out the sharp transition.
Cite
@article{arxiv.0903.3349,
title = {Noise-induced phase transition in the electronic Mach-Zehnder interferometer},
author = {Ivan P. Levkivskyi and Eugene V. Sukhorukov},
journal= {arXiv preprint arXiv:0903.3349},
year = {2009}
}
Comments
4 pages, 3 figures