Dirac surface states in superconductors: a dual topological proximity effect

2018/05/31 by Sedlmayr, Nicholas, Goodwin, E. W., Gottschalk, Michael +12
#FOS: Physical sciences #Superconductivity (cond-mat.supr-con)

paper · doi:10.48550/arxiv.1805.12330

Abstract

In this paper we present scanning tunneling microscopy of Bi₂Se₃ with superconducting Nb deposited on the surface. We find that the topologically protected surface states of the Bi₂Se₃ 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.

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