Virtual Andreev Reflection in Topological Insulator-Based Ferromagnet/Insulator/Superconductor

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• 作者：Assanai Suwanvarangkoon (2) (3)
  Bumned Soodchomshom (1)
  I-Ming Tang (3) (4)
  Rassmidara Hoonsawat (2) (3)
  
  2. Department of Physics ; Faculty of Science ; Mahidol University ; Bangkok ; 10400 ; Thailand
  3. Thailand Center of Excellence in Physics ; Commission Higher on Education ; Ministry of Education ; Bangkok ; 10400 ; Thailand
  1. Department of Physics ; Faculty of Science ; Kasetsart University ; Bangkok ; 10900 ; Thailand
  4. Department of Material Science ; Faculty of Science ; Kasetsart University ; Bangkok ; 10900 ; Thailand
  
• 关键词：Topological insulators ; Andreev reflection ; Tunneling conductance ; Dirac fermions
• 刊名：Journal of Superconductivity Incorporating Novel Magnetism
• 出版年：2015
• 出版时间：January 2015
• 年：2015
• 卷：28
• 期：1
• 页码：41-51
• 全文大小：858 KB
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• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Superconductivity, Superfluidity and Quantum Fluids
  Magnetism and Magnetic Materials
  Condensed Matter
  Characterization and Evaluation Materials
  
• 出版者：Springer New York
• ISSN：1557-1947

文摘

The property of quasiparticle tunneling on the surface of topological insulator (TI) ferromagnet-insulator-superconductor (FM-I-SC) junction is investigated. The virtual Andreev reflection (VAR) takes place when the wave vectors of electron and hole-like quasiparticles in FM are different due to gauge filed. We find that the VAR exhibits anisotropy in contrast to those in conventional and graphene-based junctions, because of gauge field on the surface of TI. The current in the junction can be carried by pure VAR, by tuning in-plane magnetic field. We also find that, the perfect linear slope of the conductance under varying in-plane magnetic fields is predicted, applicable for TI-based spintronic devices.