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

Abstract

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]
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  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:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
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)
OSTI Identifier:
1457246
Alternate Identifier(s):
OSTI ID: 1226095
Report Number(s):
LA-UR-15-24366
Journal ID: ISSN 1098-0121; PRBMDO; TRN: US1901329
Grant/Contract Number:  
AC52-06NA25396; E-1146; FA9550-09-1-0656
Resource Type:
Journal Article: 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)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE

Citation Formats

Tai, Yuan-Yen, Choi, Hongchul, Ahmed, Towfiq, Ting, C. S., and Zhu, Jian-Xin. Edge states and local electronic structure around an adsorbed impurity in a topological superconductor. United States: N. p., 2015. Web. doi:10.1103/PhysRevB.92.174514.
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Tai, Yuan-Yen, Choi, Hongchul, Ahmed, Towfiq, Ting, C. S., & Zhu, Jian-Xin. Edge states and local electronic structure around an adsorbed impurity in a topological superconductor. United States. https://doi.org/10.1103/PhysRevB.92.174514
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Tai, Yuan-Yen, Choi, Hongchul, Ahmed, Towfiq, Ting, C. S., and Zhu, Jian-Xin. Mon . "Edge states and local electronic structure around an adsorbed impurity in a topological superconductor". United States. https://doi.org/10.1103/PhysRevB.92.174514. https://www.osti.gov/servlets/purl/1457246.
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@article{osti_1457246,
title = {Edge states and local electronic structure around an adsorbed impurity in a topological superconductor},
author = {Tai, Yuan-Yen and Choi, Hongchul and Ahmed, Towfiq and Ting, C. S. and Zhu, Jian-Xin},
abstractNote = {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.},
doi = {10.1103/PhysRevB.92.174514},
url = {https://www.osti.gov/biblio/1457246}, journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 17,
volume = 92,
place = {United States},
year = {2015},
month = {11}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1103/PhysRevB.92.174514
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Citation Metrics:
Cited by: 2 works
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Figures / Tables:

FIG. 1 FIG. 1: The band structures shows the gapless edge states of the coexistence of topological and superconducting orders. a, The folded band structure of a 2-site per unit cell BZ. b-e, The band structure of a strip of width of 20 lattice constants with open and close boundary condition undermore » non-superconducting and superconducting phase. We take the periodicity along the y-direction of the strip, where 2000 $$k_y$$-points are taken. The inset of the middle panel of e is the enlargement of the crossing point of the Fermi surface, where we can find that there are totally four degnerated points around $$k_y$$ = ±$$\frac{π}{2}$$ (the green inset) and the others around $$k_y$$ = 0 and ± π are not degenerated.« less
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    Works referencing / citing this record:

    Tunneling interstitial impurity in iron-chalcogenide-based superconductors
    journal, February 2016

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      Figures / Tables found in this record:

      FIG. 1(p. 5)figure
      FIG. 2(p. 5)figure
      FIG. 3(p. 6)figure
      FIG. 4(p. 6)figure
      FIG. 5(p. 7)figure
      FIG. 6(p. 8)figure
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