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Title: Edge states and local electronic structure around an adsorbed impurity in a topological superconductor

Recently, topological superconducting states have attracted much interest. In this work, we consider a topological superconductor with Z 2 topological mirror order [Y.-Y. Tai et al., Phys. Rev. B 91, 041111(R) (2015)] and s ±-wave superconducting pairing symmetry, within a two-orbital model originally designed for iron-based superconductivity [Y.-Y. Tai et al., Europhys. Lett. 103, 67001 (2013)]. We predict the existence of gapless edge states. We also study the local electronic structure around an adsorbed interstitial magnetic impurity in the system, and find the existence of low-energy in-gap bound states even with a weak spin polarization on the impurity. We also discuss the relevance of our results to a recent scanning tunneling microscopy experiment on a Fe(Te,Se) compound with an adsorbed Fe impurity [J.-X. Yin et al., Nat. Phys. 11, 543 (2015)], for which our density functional calculations show the Fe impurity is spin polarized.
Authors:
 [1] ;  [1] ;  [1] ;  [2] ;  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Univ. of Houston, Houston, TX (United States). Texas Center for Superconductivity and Dept. of Physics
Publication Date:
Report Number(s):
LA-UR-15-24366
Journal ID: ISSN 1098-0121; PRBMDO
Grant/Contract Number:
AC52-06NA25396; E-1146; FA9550-09-1-0656
Type:
Accepted Manuscript
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 92; Journal Issue: 17; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Laboratory Directed Research and Development (LDRD) Program; Robert A. Welch Foundation; US Air Force Office of Scientific Research (AFOSR)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE
OSTI Identifier:
1457246
Alternate Identifier(s):
OSTI ID: 1226095