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Journal of Superconductivity and Novel Magnetism

, Volume 26, Issue 9, pp 2881–2883 | Cite as

Interplay of Superconductivity and Topological Order in HgTe Quantum Wells

  • I. M. Khaymovich
  • N. M. Chtchelkatchev
  • V. M. Vinokur
Original Paper

Abstract

Using the microscopic tight-binding equations we derive the effective Hamiltonian for the double-layer comprised of the two-dimensional topological insulator (TI) coupled to the s-wave isotropic superconductor (SC), and show that it contains terms describing mixing of the TI subband branches by the superconducting correlations induced by the proximity effect. We find that the proximity effect breaks down the rotational symmetry of the TI spectrum. We show that the edge states not only acquire the gap, as follows from the standard theory, but can also become localized by the Andreev-backscattering mechanism in a small coupling regime. In a strong coupling regime the edge states merge with the bulk states, and the TI transforms into an anisotropic narrow-gap semiconductor.

Keywords

Topological insulators Superconductivity 

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • I. M. Khaymovich
    • 1
  • N. M. Chtchelkatchev
    • 2
  • V. M. Vinokur
    • 3
  1. 1.IPM RASNizhny NovgorodRussia
  2. 2.HPPI & ITP L.D. Landau RASMoscowRussia
  3. 3.Argonne National LaboratoryArgonneUSA

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