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Title: Multiple topological states in iron-based superconductors

Abstract

Topological materials and unconventional iron-based superconductors are both important areas of study but, to date, relatively little overlap has been identified between these two fields. However, the combination of topological bands and superconductivity promises the manifestation of exotic superconducting states, including Majorana fermions, the central component of topological quantum computation. Here, using laser-based, spin-resolved and angle-resolved photoemission spectroscopy and density functional theory calculations, we have identified both topological insulator and Dirac semimetal states near the Fermi energy in different iron-based superconducting compounds. Carrier doping can tune these topologically non-trivial bands to the Fermi energy, potentially allowing access to several different superconducting topological states in the same material. Furthermore, these results reveal the generic coexistence of superconductivity and multiple topological states in iron-based superconductors, indicating that this broad class of materials is a promising platform for high-temperature topological superconductivity.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3];  [1];  [1];  [1];  [4];  [5];  [1];  [1];  [1]; ORCiD logo [1];  [1];  [4];  [4];  [6];  [3]; ORCiD logo [7];  [7];  [7] more »; ORCiD logo [7]; ORCiD logo [6]; ORCiD logo [8];  [9];  [10];  [10]; ORCiD logo [1] « less
+ Show Author Affiliations
  1. Univ. of Tokyo, Kashiwa (Japan)
  2. Princeton Univ., Princeton, NJ (United States)
  3. Julius-Maximilians-Univ. Wurzburg, Wurzburg (Germany)
  4. Chinese Academy of Sciences (CAS), Beijing (China)
  5. Univ. of Tokyo, Kashiwa (Japan); Univ. of Tokyo, Tokyo (Japan)
  6. Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China)
  7. Hiroshima Univ., Higashi-Hiroshima (Japan)
  8. Brookhaven National Lab. (BNL), Upton, NY (United States)
  9. Univ. of Tokyo, Tokyo (Japan)
  10. Kyoto Univ., Kyoto (Japan)
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES); Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1494043
Report Number(s):
BNL-211249-2019-JAAM
Journal ID: ISSN 1745-2473
Grant/Contract Number:  
SC0012704
Resource Type:
Accepted Manuscript
Journal Name:
Nature Physics
Additional Journal Information:
Journal Volume: 15; Journal Issue: 1; Journal ID: ISSN 1745-2473
Publisher:
Nature Publishing Group (NPG)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Zhang, Peng, Wang, Zhijun, Wu, Xianxin, Yaji, Koichiro, Ishida, Yukiaki, Kohama, Yoshimitsu, Dai, Guangyang, Sun, Yue, Bareille, Cedric, Kuroda, Kenta, Kondo, Takeshi, Okazaki, Kozo, Kindo, Koichi, Wang, Xiancheng, Jin, Changqing, Hu, Jiangping, Thomale, Ronny, Sumida, Kazuki, Wu, Shilong, Miyamoto, Koji, Okuda, Taichi, Ding, Hong, Gu, G. D., Tamegai, Tsuyoshi, Kawakami, Takuto, Sato, Masatoshi, and Shin, Shik. Multiple topological states in iron-based superconductors. United States: N. p., 2018. Web. doi:10.1038/s41567-018-0280-z.
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Zhang, Peng, Wang, Zhijun, Wu, Xianxin, Yaji, Koichiro, Ishida, Yukiaki, Kohama, Yoshimitsu, Dai, Guangyang, Sun, Yue, Bareille, Cedric, Kuroda, Kenta, Kondo, Takeshi, Okazaki, Kozo, Kindo, Koichi, Wang, Xiancheng, Jin, Changqing, Hu, Jiangping, Thomale, Ronny, Sumida, Kazuki, Wu, Shilong, Miyamoto, Koji, Okuda, Taichi, Ding, Hong, Gu, G. D., Tamegai, Tsuyoshi, Kawakami, Takuto, Sato, Masatoshi, & Shin, Shik. Multiple topological states in iron-based superconductors. United States. https://doi.org/10.1038/s41567-018-0280-z
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Zhang, Peng, Wang, Zhijun, Wu, Xianxin, Yaji, Koichiro, Ishida, Yukiaki, Kohama, Yoshimitsu, Dai, Guangyang, Sun, Yue, Bareille, Cedric, Kuroda, Kenta, Kondo, Takeshi, Okazaki, Kozo, Kindo, Koichi, Wang, Xiancheng, Jin, Changqing, Hu, Jiangping, Thomale, Ronny, Sumida, Kazuki, Wu, Shilong, Miyamoto, Koji, Okuda, Taichi, Ding, Hong, Gu, G. D., Tamegai, Tsuyoshi, Kawakami, Takuto, Sato, Masatoshi, and Shin, Shik. Mon . "Multiple topological states in iron-based superconductors". United States. https://doi.org/10.1038/s41567-018-0280-z. https://www.osti.gov/servlets/purl/1494043.
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@article{osti_1494043,
title = {Multiple topological states in iron-based superconductors},
author = {Zhang, Peng and Wang, Zhijun and Wu, Xianxin and Yaji, Koichiro and Ishida, Yukiaki and Kohama, Yoshimitsu and Dai, Guangyang and Sun, Yue and Bareille, Cedric and Kuroda, Kenta and Kondo, Takeshi and Okazaki, Kozo and Kindo, Koichi and Wang, Xiancheng and Jin, Changqing and Hu, Jiangping and Thomale, Ronny and Sumida, Kazuki and Wu, Shilong and Miyamoto, Koji and Okuda, Taichi and Ding, Hong and Gu, G. D. and Tamegai, Tsuyoshi and Kawakami, Takuto and Sato, Masatoshi and Shin, Shik},
abstractNote = {Topological materials and unconventional iron-based superconductors are both important areas of study but, to date, relatively little overlap has been identified between these two fields. However, the combination of topological bands and superconductivity promises the manifestation of exotic superconducting states, including Majorana fermions, the central component of topological quantum computation. Here, using laser-based, spin-resolved and angle-resolved photoemission spectroscopy and density functional theory calculations, we have identified both topological insulator and Dirac semimetal states near the Fermi energy in different iron-based superconducting compounds. Carrier doping can tune these topologically non-trivial bands to the Fermi energy, potentially allowing access to several different superconducting topological states in the same material. Furthermore, these results reveal the generic coexistence of superconductivity and multiple topological states in iron-based superconductors, indicating that this broad class of materials is a promising platform for high-temperature topological superconductivity.},
doi = {10.1038/s41567-018-0280-z},
journal = {Nature Physics},
number = 1,
volume = 15,
place = {United States},
year = {2018},
month = {9}
}
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Journal Article:
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https://doi.org/10.1038/s41567-018-0280-z
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Cited by: 124 works
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Figures / Tables:

FIG. 1 FIG. 1: Different topological phases and band structures of iron-based superconductors. (a - c) The out-of-plane dispersion and the corresponding (001) surface spectrum, for NI (a), TI (b) and TDS (c). We overlapped the spin-polarized surface spectrum (blue and red) on top of the spin-integrated surface spectrum (grey). (d -more » g) Band structures of LaOFeAs, BaFe2As2, LiFeAs and FeTe0.5Se0.5, respectively. The size of red circles represent the weights of As/Se $p$$z$ orbital. No band inversion between $p$$z$ and $d$$xz$/$d$$yz$ is found in LaOFeAs, while there are band inversions in BaFe2As2, LiFeAs and FeTe0.5Se0.5.« less
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    Works referencing / citing this record:

    Effect of Sintering Temperature on the Superconductivity of Bi2Se3/FeSe0.5Te0.5Composites
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    Higher Order Topology and Nodal Topological Superconductivity in Fe(Se,Te) Heterostructures
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      Figures / Tables found in this record:

      FIG. 1 (p. 4)figure
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      FIG. 6 (p. 9)figure
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