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phi-state and inverted Fraunhofer pattern in nonaligned Josephson junctions

Alidoust, Mohammad; Linder, Jacob
Journal article, Peer reviewed
Accepted version
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URI
http://hdl.handle.net/11250/2464602
Date
2013
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  • Publikasjoner fra CRIStin - NTNU [21000]
Original version
Physical Review B. Condensed Matter and Materials Physics. 2013, 87 (6), .   10.1103/PhysRevB.87.060503
Abstract
A generic nonaligned Josephson junction in the presence of an external magnetic field is theoretically considered and an unusual flux-dependent current-phase relation (CPR) is revealed. We explain the origin of the anomalous CPR via the current density flow induced by the external field within a two-dimensional quasiclassical Keldysh-Usadel framework. In particular, it is demonstrated that nonaligned Josephson junctions can be utilized to obtain a ground state other than 0 and π, corresponding to a so-called φ junction, which is tunable via the external magnetic flux. Furthermore, we show that the standard Fraunhofer central peak of the critical supercurrent may be inverted into a local minimum solely due to geometrical factors in planar junctions. This yields good consistency with a recent experimental measurement displaying such type of puzzling feature
Publisher
American Physical Society
Journal
Physical Review B. Condensed Matter and Materials Physics

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