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 · Thu Mar 08 00:00:00 EST 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; 25220707; 16H02209; 16H06013; 16H00979; 11234014; 11504117; 2016YFA0401000; 2015CB921300; XDPB08-1; XDB07000000

OSTI ID:: 1440897

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

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

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 401 works

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High-Temperature Majorana Corner States Wang, Qiyue; Liu, Cheng-Cheng; Lu, Yuan-Ming arXiv https://doi.org/10.48550/arxiv.1804.04711	text	January 2018
Multiple topological states in iron-based superconductors Zhang, Peng; Wang, Zhijun; Wu, Xianxin arXiv https://doi.org/10.48550/arxiv.1809.09977	text	January 2018
Topological quantum states of matter in iron-based superconductors: From concepts to material realization Hao, Ning; Hu, Jiangping arXiv https://doi.org/10.48550/arxiv.1811.03802	text	January 2018
Emergence of intrinsic superconductivity below 1.178 K in the topologically non-trivial semimetal state of CaSn3 Zhu, Y. L.; Hu, J.; Womack, F. N. arXiv https://doi.org/10.48550/arxiv.1811.11638	text	January 2018
Lattice symmetry assisted second order topological superconductors and Majorana patterns Pan, Xiao-Hong; Yang, Kai-Jie; Chen, Li arXiv https://doi.org/10.48550/arxiv.1812.10989	text	January 2018
A general route to form topologically-protected surface and bulk Dirac fermions along high-symmetry lines Clark, O. J.; Mazzola, F.; Marković, I. arXiv https://doi.org/10.48550/arxiv.1902.09211	text	January 2019
Higher Order Topology and Nodal Topological Superconductivity in Fe(Se,Te) Heterostructures Zhang, Rui-Xing; Cole, William S.; Wu, Xianxin arXiv https://doi.org/10.48550/arxiv.1905.10647	text	January 2019
Dirac fermions and flat bands in the ideal kagome metal FeSn Kang, Mingu; Ye, Linda; Fang, Shiang arXiv https://doi.org/10.48550/arxiv.1906.02167	text	January 2019
Topological Electronic States in HfRuP Family Superconductors Qian, Yuting; Nie, Simin; Yi, Changjiang arXiv https://doi.org/10.48550/arxiv.1906.05438	text	January 2019
Flux-induced Topological Superconductor in Planar Josephson Junction Liu, Jie; Wu, Yijia; Sun, Qing-Feng arXiv https://doi.org/10.48550/arxiv.1906.11504	text	January 2019
Exploring Topological Superconductivity in Topological Materials Li, Yupeng; Xu, Zhu-An arXiv https://doi.org/10.48550/arxiv.1907.04493	text	January 2019
Weak measurement protocols for Majorana bound state identification Manousakis, Jan; Wille, Carolin; Altland, Alexander arXiv https://doi.org/10.48550/arxiv.1910.10591	text	January 2019
Effect of electron doping in FeTe$_{1-y}$Se$_{y}$ realized by Co and Ni substitution Rosmus, M.; Kurleto, R.; Gawryluk, D. J. arXiv https://doi.org/10.48550/arxiv.1910.12530	text	January 2019
Angle-resolved photoemission spectroscopy and its application to topological materials Lv, Baiqing; Qian, Tian; Ding, Hong arXiv https://doi.org/10.48550/arxiv.2106.09797	text	January 2021
The three-dimensional electronic structure of the nematic and antiferromagnetic phases of NaFeAs from detwinned ARPES measurements Watson, Matthew D.; Aswartham, Saicharan; Rhodes, Luke C. arXiv https://doi.org/10.48550/arxiv.1710.03717	text	January 2017
Zero-energy bound states in the high-temperature superconductors at the two-dimensional limit Liu, Chaofei; Chen, Cheng; Liu, Xiaoqiang arXiv https://doi.org/10.48550/arxiv.1807.07259	text	January 2018

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