Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 66: Superconductivity: Tunneling, Josephson Junctions, SQUIDs

TT 66.15: Vortrag

Mittwoch, 18. März 2015, 19:00–19:15, H 2053

Dynamics of a driven Josephson junction at high temperature — •Tobias Rexin1,2,3, Beilei Zhu1,2,3, Robert Hoeppner1,2,3, and Ludwig Mathey1,2,3,41Uni Hamburg — 2Institut für Laserphysik Hamburg — 3Zentrum für optische Quantentechnologien — 4Center for Ultrafast Imaging

The present work investigates the dynamics of a single driven Josephson junction coupled to a thermal bath. Applying an extended version of the Fokker-Planck equation, namely the Kramers equation, we analytically treat the dynamics of both degrees of freedom the phase and the charge density. Interestingly, instead of heating the junction, the driving can suppress the phase fluctuations [1]. This is motivated by recent pump-probe experiments of high Tc superconductors reported in [2,3]. In ref [1], we have developed a description of the dynamics in these materials by modeling them as an array of Josephson junctions. The single junction model is a simplification of the Josephson junction array, which already exhibits qualitative aspects of the driven array.

[1] R.Höppner et al. preprint arXiv:1406.3609v2

[2] W. Hu, et al., Nature Materials 13, 705 (2014).

[3] S. Kaiser, et al. Phys. Rev. B 89, 184516 (2014).

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