Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 46: Superconductivity: Tunnelling, Josephson Junctions, SQUIDs 2

TT 46.1: Vortrag

Donnerstag, 29. März 2012, 17:45–18:00, H 2053

Josephson junction with magnetic-field tunable current-phase relation — •Edward Goldobin¹, Hanna Sickinger¹, Markus Turad¹, Roman Mints², Dieter Koelle¹, and Reinhold Kleiner¹ — ¹Physikalische Institut and Center for Collective Quantum Phenomena in LISA⁺, University of Tübingen, 72076 Tübingen, Germany — ²Tel Aviv University, Tel Aviv 69978, Israel

We consider an asymmetric 0-π Josephson junction consisting of 0 and π regions of different lengths L₀ and L_π in an applied magnetic field H. This system can be described by an effective sine-Gordon equation for the spatially averaged phase ψ. We demonstrate that the effective current-phase relation contains a negative term ∝sin(2ψ) as well as an additional term ∝ H cosψ [1]. Thus, the current phase relation and the ground state(s) are tunable by magnetic field. The first experimental evidences will be presented.
E. Goldobin, et al., Phys. Rev. Lett. 107, 227001 (2011).