Dresden 2017 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 14: Superconductivity: Tunnelling, Josephson Junctions, SQUIDs 1
TT 14.2: Vortrag
Montag, 20. März 2017, 15:15–15:30, HSZ 201
Andreev spectrum of a Josephson junction with spin-split superconductors — Bogusz Bujnowski1, •Dario Bercioux1,2, François Konschelle3, Jérôme Cayssol4, and Sebastian Bergeret1,3 — 1Donostia International Physics Center (DIPC) - Manuel de Lardizabal 5, E-20018 San Sebastián, Spain — 2IKERBASQUE, Basque Foundation for Science, Maria Diaz de Haro 3, 48013 Bilbao, Spain — 3Centro de Física de Materiales (CFM-MPC) Centro Mixto CSIC-UPV/EHU E-20018 Donostia-San Sebastian, Basque Country, Spain — 4LOMA (UMR-5798), CNRS and Université Bordeaux - F-33045 Talence, France
The Andreev bound states and charge transport in a Josephson junction between two superconductors with intrinsic exchange fields are studied. We find [3] that for a parallel configuration of the exchange fields in the superconductors the discrete spectrum consists of two pairs of spin-split states [1,2]. 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.
[1] P. M. Tedrow and R. Merservey, Phys. Rev. Lett., 26 192 (1971).
[2] R. Merservey and P. M. Tedrow, Phys. Rep., 238 173 (1994) .
[3] B. Bujnowski, et. al, EPL 115, 67001 (2016).