Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 17: Superconductivity: Tunnelling, Josephson Junctions, SQUIDs
TT 17.12: Vortrag
Montag, 31. März 2014, 18:00–18:15, HSZ 201
Quasiperiodicity and revivals in dynamics of quantum phase slips in Josephson junction chains and superconducting nanowires — •Gianluca Rastelli1,3, Mihajlo Vanević2, and Wolfgang Belzig3 — 1Zukunftskolleg, Universität Konstanz, Germany — 2Department of Physics, University of Belgrade, Serbia — 3Fachbereich Physik, Universität Konstanz, Germany
Quantum phase slips in superconducting loops threaded by an external magnetic field provide a coupling between macroscopic quantum states with supercurrents circulating in opposite directions. We analyze dynamics of the phase slips as a function of the superconducting loop length, from fully coherent dynamics for short loops to dissipative dynamics for the long ones. For intermediate lengths of the superconducting loop, we find that the phase slips are coupled to a discrete bath of oscillators with frequencies comparable to the phase-slip amplitude. This gives rise to a quasi-periodic dynamics of the phase slips which manifests itself as a decay of oscillations between the two counterpropagating current states at short times, followed by oscillation revivals at later times. We analyze possible experimental implications of this non-adiabatic regime in Josephson junction chains and superconducting nanowires.