Dresden 2017 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 55: Poster Session: Superconductivity 2
TT 55.16: Poster
Wednesday, March 22, 2017, 15:00–19:00, P2-OG3
On quantum features of a driven swept-bias Josephson junction — •Harald Losert1, Karl Vogel1, Benjamin Neumeier2, Rosina Menditto2, Edward Goldobin2, Dieter Kölle2, Reinhold Kleiner2, and Wolfgang P. Schleich1,3 — 1Institut für Quantenphysik, Universität Ulm, D-89069 Ulm, Germany — 2Physikalisches Institut, Universität Tübingen, D-72076 Tübingen, Germany — 3Texas A&M University, College Station, TX 77843
Josephson junctions are a well-known model system for the observation of quantum tunneling. The phase difference in a current-biased junction behaves like the position of a particle in a tilted washboard potential. The escape of this phase-particle corresponds to the voltage switching of the associated junction.
The escape from the potential can be explained quantum mechanically by tunneling from the ground state, or an excited state. However, in the presence of a periodic driving field, it has been shown [1][2], that even classical calculations reproduce the experimental data for quantum mechanical key features, e.g. Rabi oscillations.
Resuming this discussion, we focus on Josephson junctions with large critical currents and consider a swept-bias experimental setup. We compare the switching current distributions of our recent experiments with numerical results for both quantum mechanical as well as classical time evolution.
[1] Marchese et al., Eur. Phys. J. Special Topics 147, 333 (2007)
[2] Blackburn et al., Phys. Rev. B 85, 104501 (2012)