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Patterning via Optical Saturable Transitions - Fabrication and Characterization
Published on: December 11, 2014
Noise-induced phase transition in the electronic Mach-Zehnder interferometer
Ivan P Levkivskyi1, Eugene V Sukhorukov
1Département de Physique Théorique, Université de Genève, CH-1211 Genève 4, Switzerland.
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 of 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.
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