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

Tai, Yuan-Yen; Choi, Hongchul; Ahmed, Towfiq; Ting, C. S.; Zhu, Jian-Xin

doi:10.1103/PhysRevB.92.174514

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

Journal Article · Mon Nov 16 00:00:00 EST 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.92.174514· OSTI ID:1457246

Tai, Yuan-Yen ^[1]; Choi, Hongchul ^[1]; Ahmed, Towfiq ^[1]; Ting, C. S. ^[2]; Zhu, Jian-Xin ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of Houston, Houston, TX (United States). Texas Center for Superconductivity and Dept. of Physics

Recently, topological superconducting states have attracted much interest. In this work, we consider a topological superconductor with Z₂ 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.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Laboratory Directed Research and Development (LDRD) Program; Robert A. Welch Foundation; US Air Force Office of Scientific Research (AFOSR)

Grant/Contract Number:: AC52-06NA25396; E-1146; FA9550-09-1-0656

OSTI ID:: 1457246

Alternate ID(s):: OSTI ID: 1226095

Report Number(s):: LA-UR-15-24366; PRBMDO; TRN: US1901329

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 92, Issue 17; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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