Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 12: Poster Session Superconductivity
TT 12.10: Poster
Montag, 11. März 2013, 15:00–19:00, Poster D
Dynamical Coulomb Blockade: From bumpy oscillations to elevator rides — •Selina Rohrer, Vera Gramich, Björn Kubala, Jürgen T. Stockburger, and Joachim Ankerhold — Institut für Theoretische Physik, Universität Ulm, Albert-Einstein-Allee 11, 89069 Ulm, Germany
Recently the photonic side of the dynamical coulomb blockade was explored by measuring the emitted radiation of a dc voltage-biased Josephson junction embedded in a microwave resonator [1]. In order to gain a better understanding of the strong coupling case, we investigate the classical (typically chaotic) dynamics of the system. Extending this dynamics to a Langevin-type description, well-defined dynamical steady states are obtained.
In addition to limit cycles with the Josephson frequency ωJ, we observe marginally damped cycles at subharmonics as well as bifurcations. For very strong coupling between resonator and Josephson junction highly structured, asymmetric limit cycles at low frequencies are observed, which can intuitively be interpreted as "elevator-like" dynamics.
[1] M. Hofheinz et al., PRL 106, 217005 (2011)