• 文献标题:   Strain-modulated anisotropic Andreev reflection in a graphene-based superconducting junction
  • 文献类型:   Article
  • 作  者:   ZHOU XF, XU ZM, CAO DL, QI FH
  • 作者关键词:   graphene, uniaxial strain, anisotropic andreev reflection
  • 出版物名称:   CHINESE PHYSICS B
  • ISSN:   1674-1056 EI 2058-3834
  • 通讯作者地址:  
  • 被引频次:   0
  • DOI:   10.1088/1674-1056/ac7553
  • 出版年:   2022

▎ 摘  要

We investigate the Andreev reflection across a uniaxial strained graphene-based superconducting junction. Compared with pristine graphene-based superconducting junction, three opposite properties are found. Firstly, in the regime of the interband conversion of electron-hole, the Andreev retro-reflection happens. Secondly, in the regime of the intraband conversion of electron-hole, the specular Andreev reflection happens. Thirdly, the perfect Andreev reflection, electron-hole conversion with unit efficiency, happens at a nonzero incident angle of electron. These three exotic properties arise from the strain-induced anisotropic band structure of graphene, which breaks up the original relation between the direction of velocity of particle and the direction of the corresponding wavevector. Our finding gives an insight into the understanding of Andreev reflection and provides an alternative method to modulate the Andreev reflection.