TY - JOUR
T1 - Experimental evidence of a φ Josephson junction
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.
PY - 2012/9/7
Y1 - 2012/9/7
N2 - We demonstrate experimentally the existence of Josephson junctions having a doubly degenerate ground state with an average Josephson phase ψ=±φ. The value of φ can be chosen by design in the interval 0<φ<π. The junctions used in our experiments are fabricated as 0-π Josephson junctions of moderate normalized length with asymmetric 0 and π regions. We show that (a) these φ Josephson junctions have two critical currents, corresponding to the escape of the phase ψ from -φ and +φ states, (b) the phase ψ 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.
AB - We demonstrate experimentally the existence of Josephson junctions having a doubly degenerate ground state with an average Josephson phase ψ=±φ. The value of φ can be chosen by design in the interval 0<φ<π. The junctions used in our experiments are fabricated as 0-π Josephson junctions of moderate normalized length with asymmetric 0 and π regions. We show that (a) these φ Josephson junctions have two critical currents, corresponding to the escape of the phase ψ from -φ and +φ states, (b) the phase ψ 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.
UR - http://www.scopus.com/inward/record.url?scp=84866135862&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.109.107002
DO - 10.1103/PhysRevLett.109.107002
M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???
AN - SCOPUS:84866135862
SN - 0031-9007
VL - 109
JO - Physical Review Letters
JF - Physical Review Letters
IS - 10
M1 - 107002
ER -