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Strongly anharmonic current-phase relation in ballistic graphene Josephson junctions

Black-Schaffer, Annica; Linder, Jacob
Journal article, Peer reviewed
Accepted version
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URI
http://hdl.handle.net/11250/2455033
Date
2010
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Original version
Physical Review B. Condensed Matter and Materials Physics. 2010, 82 (18), .   10.1103/PhysRevB.82.184522
Abstract
Motivated by a recent experiment directly measuring the current-phase relation (CPR) in graphene under the influence of a superconducting proximity effect, we here study the temperature dependence of the CPR in ballistic graphene superconductor-normal metal-superconductor (SNS) Josephson junctions within the self-consistent tight-binding Bogoliubov-de Gennes (BdG) formalism. By comparing these results with the standard Dirac-BdG method, where rigid boundary conditions are assumed at the S∣N interfaces, we show on a crucial importance of both proximity effect and depairing by current for the CPR. The proximity effect grows with temperature and reduces the skewness of the CPR toward the harmonic result. In short junctions (L
Publisher
American Physical Society
Journal
Physical Review B. Condensed Matter and Materials Physics

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