Superconducting topological surface states in the noncentrosymmetric bulk superconductor PbTaSe2.

Abstract:

:The search for topological superconductors (TSCs) is one of the most urgent contemporary problems in condensed matter systems. TSCs are characterized by a full superconducting gap in the bulk and topologically protected gapless surface (or edge) states. Within each vortex core of TSCs, there exists the zero-energy Majorana bound states, which are predicted to exhibit non-Abelian statistics and to form the basis of the fault-tolerant quantum computation. To date, no stoichiometric bulk material exhibits the required topological surface states (TSSs) at the Fermi level (EF) combined with fully gapped bulk superconductivity. We report atomic-scale visualization of the TSSs of the noncentrosymmetric fully gapped superconductor PbTaSe2. Using quasi-particle scattering interference imaging, we find two TSSs with a Dirac point at E ≅ 1.0 eV, of which the inner TSS and the partial outer TSS cross EF, on the Pb-terminated surface of this fully gapped superconductor. This discovery reveals PbTaSe2 as a promising candidate for TSC.

journal_name

Sci Adv

journal_title

Science advances

authors

Guan SY,Chen PJ,Chu MW,Sankar R,Chou F,Jeng HT,Chang CS,Chuang TM

doi

10.1126/sciadv.1600894

subject

Has Abstract

pub_date

2016-11-23 00:00:00

pages

e1600894

issue

11

issn

2375-2548

pii

1600894

journal_volume

2

pub_type

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