TY  - JOUR
AU  - Sickinger, H.
AU  - Lipman, A.
AU  - Weides, M.
AU  - Mints, R.G.
AU  - Kohlstedt, H.
AU  - Koelle, D.
AU  - Kleiner, R.
AU  - Goldobin, E.
TI  - Experimental evidence of a phi-Josephson Junction
JO  - Physical review letters
VL  - 109
SN  - 0031-9007
CY  - College Park, Md.
PB  - APS
M1  - PreJuSER-22767
SP  - 107002
PY  - 2012
N1  - 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.
AB  - 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.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000308458900017
DO  - DOI:10.1103/PhysRevLett.109.107002
UR  - https://juser.fz-juelich.de/record/22767
ER  -