• 文献标题:   Unified Formula for Stationary Josephson Current in Planar Graphene Junctions
  • 文献类型:   Article
  • 作  者:   TAKANE Y
  • 作者关键词:  
  • 出版物名称:   JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
  • ISSN:   0031-9015
  • 通讯作者地址:   Hiroshima Univ
  • 被引频次:   0
  • DOI:   10.7566/JPSJ.89.094702
  • 出版年:   2020

▎ 摘  要

The stationary Josephson current in a ballistic graphene system is theoretically studied with focus on a planar junction consisting of a monolayer graphene sheet on top of which a pair of superconducting electrodes is deposited. To characterize such a planar junction, we employ two parameters: the coupling strength between the graphene sheet and the superconducting electrodes, and a potential drop induced in the graphene sheet by direct contact with the electrodes. We derive a general formula for the Josephson current by taking these parameters into account in addition to other basic parameters, such as temperature and chemical potential. The resulting formula applies to a wide range of parameters and reproduces previously reported results in certain limits.