• 文献标题:   Y-Shaped Spin Filter in Graphene with Rashba Spin-Orbit Coupling
  • 文献类型:   Article
  • 作  者:   LIU JF, CHAN KS
  • 作者关键词:   zigzag graphene ribbon, yshaped junction, edge state, rashba coupling, spinfiltering
  • 出版物名称:   JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
  • ISSN:   0031-9015
  • 通讯作者地址:   South Univ Sci Technol China
  • 被引频次:   8
  • DOI:   10.7566/JPSJ.82.074711
  • 出版年:   2013

▎ 摘  要

We propose a graphene Y-shaped spin filter with three zigzag-edged terminals in the presence of the Rashba spin-orbit interaction (RSOI). The three terminal spin-dependent conductances are calculated numerically using the lattice Green function. The results show that the spin polarization is nearly 100% for strong spin-orbit coupling and a suitable Fermi energy. The polarization direction can be tuned by controlling the structure parameters. It is interesting that the conductance of the first channel is heavily suppressed by the edge states localized at the edges of the zigzag ribbon terminals and can be significantly enhanced by Rashba coupling at the junction.