Experimental evidence of a phi-Josephson Junction

Sickinger, H.; Kleiner, R.; Lipman, A.; Goldobin, E.; Koelle, D.; Mints, R.G.; Kohlstedt, H.; Weides, M.

doi:10.1103/PhysRevLett.109.107002

Journal Article

Experimental evidence of a phi-Josephson Junction

Sickinger, H. ; Lipman, A. ; Weides, M.FZJ* ; Mints, R. G. ; Kohlstedt, H.FZJ* ; Koelle, D. ; Kleiner, R. ; Goldobin, E.

2012
APS College Park, Md.

Physical review letters 109, 107002 (2012) [10.1103/PhysRevLett.109.107002]

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Please use a persistent id in citations: http://hdl.handle.net/2128/7586 doi:10.1103/PhysRevLett.109.107002

Abstract: We demonstrate experimentally the existence of Josephson junctions having a doubly degenerate ground state with an average Josephson phase psi = +/-phi. The value of phi can be chosen by design in the interval 0 < phi < pi. The junctions used in our experiments are fabricated as 0-pi Josephson junctions of moderate normalized length with asymmetric 0 and pi regions. We show that (a) these phi Josephson junctions have two critical currents, corresponding to the escape of the phase c from -phi and +phi states, (b) the phase psi can be set to a particular state by tuning an external magnetic field, or (c) by using a proper bias current sweep sequence. The experimental observations are in agreement with previous theoretical predictions.

Keyword(s): J

Classification:

Physics, Multidisciplinary

Note: We acknowledge financial support by the German Israeli Foundation (Grant No. G-967-126.14/2007) and DFG (via SFB/TRR-21, project A5 as well via project Go-1106/3). H. S. gratefully acknowledges support by the Evangelisches Studienwerk e. V. Villigst.

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