Quantum phase diffusion in ac-driven superconducting atomic point contacts

M. F. Carusela and J. Ankerhold
Phys. Rev. B 85, 134509 – Published 10 April 2012

Abstract

The impact of quantum fluctuations on the phase diffusion in resistively shunted superconducting quantum points subject to an external ac voltage is studied. Based on an extension of the classical Smoluchowski equation to the quantum regime, numerical results for fractional and integer Shapiro resonances are investigated to reveal characteristic features of quantum effects. It is shown that, typically in the quantum regime, the broadening of resonances cannot be described simply by an effective temperature.

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  • Received 4 November 2011

DOI:https://doi.org/10.1103/PhysRevB.85.134509

©2012 American Physical Society

Authors & Affiliations

M. F. Carusela*

  • Instituto de Ciencias, Universidad Nacional de General Sarmiento, Buenos Aires, Argentina and CONICET, Buenos Aires, Argentina

J. Ankerhold

  • Institut für theoretische Physik, Universität Ulm, Albert-Einstein-Allee 11, D-89069 Ulm, Germany

  • *flor@ungs.edu.ar

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Issue

Vol. 85, Iss. 13 — 1 April 2012

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