• Emerging Trends in Topological Insulators and Topological Superconductors

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/reso/022/08/0787-0800

    • Keywords

       

      Superconductor, quantum Hall effect, topological insulator, Majorana fermions.

    • Abstract

       

      Topological insulators are new class of materials which arecharacterized by a bulk band gap like ordinary band insulatorsbut have protected conducting states on their edgesor surfaces. These states emerge due to the combination ofspin-orbit coupling and time reversal symmetry. Also, thesestates are insensitive to scattering by non-magnetic impurities.A two-dimensional topological insulator has one dimensionaledge states in which the spin-momentum locking ofthe electrons give rise to quantum spin Hall effect. A threedimensionaltopological insulator supports novel spin-polarized2D Dirac fermions on its surface. These topological insulatormaterials have been theoretically predicted and experimentallyobserved in a variety of 2D and 3D systems, includingHgTe quantum wells, BiSb alloys, and Bi2Te3, Bi2Se3 crystals.Moreover, proximity induced superconductivity in these systemscan lead to a state that supports zero energy Majoranafermions, and the phase is known as topological superconductors.In this article, the basic idea of topological insulatorsand topological superconductors are presented alongwith their experimental development.

    • Author Affiliations

       

      A M Jayannavar1 Arijit Saha

      1. Insitute of Physics, Sachivalaya Marg, Bhubaneswar 751 005, India.
    • Dates

       
  • Resonance – Journal of Science Education | News

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