Description: Experimental evidence of a phi-Josephson Junction

This title appears in the Scientific Report : 2012

Experimental evidence of a phi-Josephson Junction

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...

Personal Name(s):	Sickinger, H.
	Lipman, A. / Weides, M. / Mints, R.G. / Kohlstedt, H. / Koelle, D. / Kleiner, R. / Goldobin, E.
Contributing Institute:	Elektronische Materialien; PGI-7 JARA-FIT; JARA-FIT
Published in:	Physical review letters, 109 (2012) S. 107002
Imprint:	College Park, Md. APS 2012
Physical Description:	107002
DOI:	10.1103/PhysRevLett.109.107002
Document Type:	Journal Article
Research Program:	Grundlagen für zukünftige Informationstechnologien
Series Title:	Physical Review Letters 109
Subject (ZB):	J
Link:	Get full text OpenAccess
	Publikationsportal JuSER

Please use the identifier: http://dx.doi.org/10.1103/PhysRevLett.109.107002 in citations.
Please use the identifier: http://hdl.handle.net/2128/7586 in citations.

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.