Dresden 2014 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 17: Superconductivity: Tunnelling, Josephson Junctions, SQUIDs

TT 17.2: Talk

Monday, March 31, 2014, 15:15–15:30, HSZ 201

ϕ-Josephson junctions based on current injectors — •rosina menditto¹, hanna sickinger¹, johannes maximilian meckbach², michael merker², konstantin ilin², michael siegel², dieter kölle¹, and reinhold kleiner¹ — ¹Physikalisches Institut and Center vor Collective Quantum Phenomena in LISA+, Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany — ²Institut für Mikro- und Nanoelektronische Systeme, Karlsruher Institut für Technologie, Hertzstrasse 16, D-76187 Karlsruhe, Germany

We propose and implement ϕ-Josephson junctions with high critical current density fabricated using Nb/AlO_x/Nb technology. In previous works we showed that in conventional junctions a π, or more general a κ, phase discontinuity can be realized by means of a pair of tiny current injectors placed in the middle of the junction. Currently, we introduced two additional pairs of injectors in asymmetric positions, in order to obtain a ϕ-junction completely tunable electronically. By controlling the external magnetic field and the current flowing in the secondary injectors, we are able to investigate several effects: preparation and readout of the initial state, rearrangements of fractional vortices, thermal/resonant escape and retrapping of the phase.