Dirac surface states in superconductors: a dual topological proximity effect

Nicholas Sedlmayr; E. W. Goodwin; Michael Gottschalk; Ian M. Dayton; Can Zhang; Erik Huemiller; Reza Loloee; Thomas C. Chasapis; Maryam Salehi; Nikesh Koirala; Mercouri G. Kanatzidis; Seongshik Oh; D. J. Van Harlingen; Alex Levchenko; S. H. Tessmer

Dirac surface states in superconductors: a dual topological proximity effect

Superconductivity 2020-04-10 v2

Authors: Nicholas Sedlmayr , E. W. Goodwin , Michael Gottschalk , Ian M. Dayton , Can Zhang , Erik Huemiller , Reza Loloee , Thomas C. Chasapis , Maryam Salehi , Nikesh Koirala , Mercouri G. Kanatzidis , Seongshik Oh , D. J. Van Harlingen , Alex Levchenko , S. H. Tessmer

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Abstract

In this paper we present scanning tunneling microscopy of Bi $_2$ Se $_3$ with superconducting Nb deposited on the surface. We find that the topologically protected surface states of the Bi $_2$ Se $_3$ leak into the superconducting over-layer, suggesting a dual topological proximity effect. Coupling between theses states and the Nb states leads to an effective pairing mechanism for the surface states, leading to a modified model for a topological superconductor in these systems. This model is consistent with fits between the experimental data and the theory.

Keywords

dirac surface states topological superconductor proximity effect bi2se3 scanning tunneling microscopy superconducting overlay

Cite

@article{arxiv.1805.12330,
  title  = {Dirac surface states in superconductors: a dual topological proximity effect},
  author = {Nicholas Sedlmayr and E. W. Goodwin and Michael Gottschalk and Ian M. Dayton and Can Zhang and Erik Huemiller and Reza Loloee and Thomas C. Chasapis and Maryam Salehi and Nikesh Koirala and Mercouri G. Kanatzidis and Seongshik Oh and D. J. Van Harlingen and Alex Levchenko and S. H. Tessmer},
  journal= {arXiv preprint arXiv:1805.12330},
  year   = {2020}
}

Dirac surface states in superconductors: a dual topological proximity effect

Abstract

Keywords

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