%0 Journal Article
%A Sickinger, H.
%A Lipman, A.
%A Weides, M.
%A Mints, R.G.
%A Kohlstedt, H.
%A Koelle, D.
%A Kleiner, R.
%A Goldobin, E.
%T Experimental evidence of a phi-Josephson Junction
%J Physical review letters
%V 109
%@ 0031-9007
%C College Park, Md.
%I APS
%M PreJuSER-22767
%P 107002
%D 2012
%Z 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.
%X 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.
%K J (WoSType)
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000308458900017
%R 10.1103/PhysRevLett.109.107002
%U https://juser.fz-juelich.de/record/22767