Superconductivity with twofold symmetry in Bi2Te3/FeTe0.55Se0.45 heterostructures.

Abstract:

:Topological superconductors are an interesting and frontier topic in condensed matter physics. In the superconducting state, an order parameter will be established with the basic or subsidiary symmetry of the crystalline lattice. In doped Bi2Se3 or Bi2Te3 with a basic threefold symmetry, it was predicted, however, that bulk superconductivity with order parameters of twofold symmetry may exist because of the presence of odd parity. We report the proximity effect-induced superconductivity in the Bi2Te3 thin film on top of the iron-based superconductor FeTe0.55Se0.45. By using the quasiparticle interference technique, we demonstrate clear evidence of twofold symmetry of the superconducting gap. The gap minimum is along one of the main crystalline axes following the so-called Δ4y notation. This is also accompanied by the elongated vortex shape mapped out by the density of states within the superconducting gap. Our results provide an easily accessible platform for investigating possible topological superconductivity in Bi2Te3/FeTe0.55Se0.45 heterostructures.

journal_name

Sci Adv

journal_title

Science advances

authors

Chen M,Chen X,Yang H,Du Z,Wen HH

doi

10.1126/sciadv.aat1084

subject

Has Abstract

pub_date

2018-06-08 00:00:00

pages

eaat1084

issue

6

issn

2375-2548

pii

aat1084

journal_volume

4

pub_type

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