Broken time-reversal symmetry in Josephson junction involving two-band superconductors

A novel time-reversal symmetry breaking state is found theoretically in the Josephson junction between a two-gap superconductor and a conventional s-wave superconductor. This occurs as a result of frustration between the three order parameters analogous to two antiferromagnetically coupled XY-spins...

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Bibliographic Details
Published in:Europhysics letters 2009-07, Vol.87 (1), p.17003-p1-5
Main Authors: Ng, T. K, Nagaosa, N
Format: Article
Language:English
Subjects:
74.20.-z
74.20.De
74.45.+c
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Summary:A novel time-reversal symmetry breaking state is found theoretically in the Josephson junction between a two-gap superconductor and a conventional s-wave superconductor. This occurs as a result of frustration between the three order parameters analogous to two antiferromagnetically coupled XY-spins put under a magnetic field. This leads to formation of interface states with energies inside the superconducting gap and modified flux quantization condition for a ring composed of the two types of superconductors.
ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/87/17003