Observation of topological superconductivity on the surface of an iron-based superconductor

Zhang, Peng; Yaji, Koichiro; Hashimoto, Takahiro; Ota, Yuichi; Kondo, Takeshi; Okazaki, Kozo; Wang, Zhijun; Wen, Jinsheng; Gu, G. D.; Ding, Hong; Shin, Shik

doi:10.1126/science.aan4596

Title: Observation of topological superconductivity on the surface of an iron-based superconductor

Journal Article · 08 March 2018 · Science

DOI: https://doi.org/10.1126/science.aan4596 · OSTI ID:1440897

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Univ. of Tokyo (Japan). Inst. for Solid State Physics
Princeton Univ., NJ (United States). Dept. of Physics
Nanjing Univ. (China). National Lab. of Solid State Microstructures and Dept. of Physics
Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics. Beijing National Lab. for Condensed Matter Physics (BNLCP-CAS); Univ. of Chinese Academy of Sciences (CAS), Beijing (China). CAS Center for Excellence in Topological Quantum Computation

Topological superconductors are predicted to host exotic Majorana states that obey non-Abelian statistics and can be used to implement a topological quantum computer. Most of the proposed topological superconductors are realized in difficult-to-fabricate heterostructures at very low temperatures. By using high-resolution spin-resolved and angle-resolved photoelectron spectroscopy, we find that the iron-based superconductor FeTe_1–xSe_x (x = 0.45; superconducting transition temperature T_c = 14.5 kelvin) hosts Dirac-cone–type spin-helical surface states at the Fermi level; the surface states exhibit an s-wave superconducting gap below T_c. Thus, our study shows that the surface states of FeTe_0.55Se_0.45 are topologically superconducting, providing a simple and possibly high-temperature platform for realizing Majorana states.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; Ministry of Education, Culture, Sports, Science and Technology (MEXT); Japan Society for the Promotion of Science (JSPS); National Natural Science Foundation of China (NSFC); Ministry of Science and Technology (MOST); Chinese Academy of Sciences (CAS)

Grant/Contract Number:: SC0012704

OSTI ID:: 1440897

Report Number(s):: BNL--205750-2018-JAAM

Journal Information:: Science, Journal Name: Science Journal Issue: 6385 Vol. 360; ISSN 0036-8075

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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