• 文献标题:   Electron retroreflection and spin beam splitting in a twisted graphene bilayer
  • 文献类型:   Article
  • 作  者:   XU YF, JIN GJ
  • 作者关键词:   twisted graphene bilayer, superconductor junction, electron retroreflection, spin beam splitting
  • 出版物名称:   SOLID STATE COMMUNICATIONS
  • ISSN:   0038-1098 EI 1879-2766
  • 通讯作者地址:   Nanjing Univ
  • 被引频次:   1
  • DOI:   10.1016/j.ssc.2016.08.019
  • 出版年:   2016

▎ 摘  要

We theoretically investigate the various reflection processes in a twisted graphene bilayer-based normal conductor/superconductor junction. It is found that the special spinor wave functions in strongly doped superconductor region lead the Andreev reflection to be suppressed completely. For the 100% electron -> electron reflection, except the traditional specular reflection, electrons can undergo retroreflection, which is sensitive to the band contour and can be used to confirm the van Hove singularities in the twisted graphene bilayer. By depositing a ferromagnetic insulator on the N region, we further find that electrons can be spatially separated with spin-down electrons specular reflected and spin-up electrons retroreflected, or vice versa. It provides a new mechanism to realize a spin beam splitter. (C) 2016 Elsevier Ltd. All rights reserved.