Josephson current in ballistic superconductor-graphene systems

We calculate the phase, the temperature and the junction length dependence of the supercurrent for ballistic graphene Josephson junctions. For low temperatures we find nonsinusoidal dependence of the supercurrent on the superconductor phase difference for both short and long junctions. The skewness,...

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Published: 2010
Online Access:http://hdl.handle.net/10831/43261
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spelling edit-10831-432612020-04-14T01:46:59Z Josephson current in ballistic superconductor-graphene systems Hagymasi, I Kormanyos, A Cserti, J We calculate the phase, the temperature and the junction length dependence of the supercurrent for ballistic graphene Josephson junctions. For low temperatures we find nonsinusoidal dependence of the supercurrent on the superconductor phase difference for both short and long junctions. The skewness, which characterizes the deviaton of the current-phase relation from a simple sinusoidal one, shows a linear dependence on the critical current for small currents. We discuss the similarities and differences with respect to the classical theory of Josephson junctions, where the weak link is formed by a diffusive or ballistic metal. The relation to other recent theoretical results on graphene Josephson junctions is pointed out and the possible experimental relevance of our work is considered as well. 2010 info:eu-repo/semantics/article http://hdl.handle.net/10831/43261 doi:10.1103/PhysRevB.82.134516 elte:000282809000005 elte:78049431117 elte:1804709 elte:13 elte:PHYS REV B elte:PHYSICAL REVIEW B elte:82 elte:10067248 info:eu-repo/semantics/openAccess application/pdf LOMS: https://edit.elte.hu/xmlui/bitstream/10831/43261/1/PhysRevB.82.134516.pdf
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description We calculate the phase, the temperature and the junction length dependence of the supercurrent for ballistic graphene Josephson junctions. For low temperatures we find nonsinusoidal dependence of the supercurrent on the superconductor phase difference for both short and long junctions. The skewness, which characterizes the deviaton of the current-phase relation from a simple sinusoidal one, shows a linear dependence on the critical current for small currents. We discuss the similarities and differences with respect to the classical theory of Josephson junctions, where the weak link is formed by a diffusive or ballistic metal. The relation to other recent theoretical results on graphene Josephson junctions is pointed out and the possible experimental relevance of our work is considered as well.
format Journal Article
physical application/pdf
author Hagymasi, I
spellingShingle Hagymasi, I
Josephson current in ballistic superconductor-graphene systems
author_facet Hagymasi, I
Kormanyos, A
Cserti, J
author2 Kormanyos, A
Cserti, J
title Josephson current in ballistic superconductor-graphene systems
title_short Josephson current in ballistic superconductor-graphene systems
title_full Josephson current in ballistic superconductor-graphene systems
title_fullStr Josephson current in ballistic superconductor-graphene systems
title_full_unstemmed Josephson current in ballistic superconductor-graphene systems
title_sort josephson current in ballistic superconductor-graphene systems
publishDate 2010
publishDateSort 2010
url http://hdl.handle.net/10831/43261
first_indexed 2020-04-14T01:46:59Z
last_indexed 2023-09-01T11:47:18Z
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score 13,365045