Volume 115, Number 6, September 2016
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||24 October 2016|
Andreev spectrum of a Josephson junction with spin-split superconductors
1 Donostia International Physics Center (DIPC) - Manuel de Lardizabal 5, E-20018 San Sebastián, Spain
2 IKERBASQUE, Basque Foundation of Science - E-48011 Bilbao, Basque Country, Spain
3 Centro de Física de Materiales (CFM-MPC) Centro Mixto CSIC-UPV/EHU E-20018 Donostia-San Sebastian, Basque Country, Spain
4 LOMA (UMR-5798), CNRS and Université Bordeaux - F-33045 Talence, France
Received: 27 July 2016
Accepted: 28 September 2016
The Andreev bound states and charge transport in a Josephson junction between two superconductors with intrinsic exchange fields are studied. We find that for a parallel configuration of the exchange fields in the superconductors the discrete spectrum consists of two pairs of spin-split states. The Josephson current in this case is mainly carried by bound states. In contrast, for the antiparallel configuration we find that there is no spin-splitting of the bound states and that for phase differences smaller than a certain critical value there are no bound states at all. Hence the supercurrent is only carried by states in the continuous part of the spectrum. Our predictions can be tested by performing a tunneling spectroscopy of a weak link between two spin-split superconductors.
PACS: 74.50.+r – Tunneling phenomena; Josephson effects / 74.78.Na – Mesoscopic and nanoscale systems / 72.25.-b – Spin polarized transport
© EPLA, 2016
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