Signature of proximity-induced px+ipy triplet pairing in the doped topological insulator Bi2Se3 by the s-wave superconductor NbN

Gad Koren, Tal Kirzhner, Yoav Kalcheim, Oded Millo

Research output: Contribution to journalArticlepeer-review

Abstract

In the search for Majorana fermions in proximity-induced topological superconducting junctions, we happened to find a signature of same-spin triplet superconductivity which appears to dominate these elusive elementary excitations. Thin-film junctions and bilayers of the doped topological insulator Bi2Se3 and the s-wave superconductor NbN exhibit conductance spectra with coexisting prominent zero-bias and coherence peaks. Various tunneling models with different pair potentials have failed to fit our data, except for the triplet px + ipy pair potential, which breaks time-reversal symmetry, that yielded reasonably good fits. This provides supporting evidence for proximity-induced triplet superconductivity in the Bi2Se 3 layer near the interface with the NbN film.

Original languageEnglish
Article number67010
JournalEPL
Volume103
Issue number6
DOIs
StatePublished - Sep 2013

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

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