Quantum charge diffusion in underdamped Josephson junctions and superconducting nanowiresA. Zazunov, N. Didier and F. W. J. Hekking
Université Joseph Fourier, Laboratoire de Physique et de Modélisation des Milieux Condensés, CNRS BP 166, 38042 Grenoble, France, EU
received 11 March 2008; accepted in final form 8 July 2008; published August 2008
published online 19 August 2008
The effect of quantum fluctuations on the current-voltage characteristics of Josephson junctions and superconducting nanowires is studied in the underdamped limit. Quantum fluctuations induce transitions between a Coulomb blockade and a supercurrent branch, and can significantly modify the shape of current-voltage characteristics in the case of a highly resistive environment. Owing to the phase-charge duality, our results can be directly extended to the opposite overdamped limit.
74.78.Na - Mesoscopic and nanoscale systems.
74.50.+r - Tunneling phenomena; point contacts, weak links, Josephson effects.
73.23.Hk - Coulomb blockade; single-electron tunneling.
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