Observation of topological superconductivity on the surface of an iron-based superconductor
Abstract
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 FeTe1–xSex (x = 0.45; superconducting transition temperature Tc = 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 Tc. Thus, our study shows that the surface states of FeTe0.55Se0.45 are topologically superconducting, providing a simple and possibly high-temperature platform for realizing Majorana states.
- Authors:
-
[1];
[1];
[1];
[1];
[1];
[2];
[3];
[4];
[5];
[1]
- 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
- Publication Date:
- Research Org.:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Org.:
- 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)
- OSTI Identifier:
- 1440897
- Report Number(s):
- BNL-205750-2018-JAAM
Journal ID: ISSN 0036-8075
- Grant/Contract Number:
- SC0012704; 25220707; 16H02209; 16H06013; 16H00979; 11234014; 11504117; 2016YFA0401000; 2015CB921300; XDPB08-1; XDB07000000
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Science
- Additional Journal Information:
- Journal Volume: 360; Journal Issue: 6385; Journal ID: ISSN 0036-8075
- Publisher:
- AAAS
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 97 MATHEMATICS AND COMPUTING
Citation Formats
Zhang, Peng, Yaji, Koichiro, Hashimoto, Takahiro, Ota, Yuichi, Kondo, Takeshi, Okazaki, Kozo, Wang, Zhijun, Wen, Jinsheng, Gu, G. D., Ding, Hong, and Shin, Shik. Observation of topological superconductivity on the surface of an iron-based superconductor. United States: N. p., 2018.
Web. doi:10.1126/science.aan4596.
Zhang, Peng, Yaji, Koichiro, Hashimoto, Takahiro, Ota, Yuichi, Kondo, Takeshi, Okazaki, Kozo, Wang, Zhijun, Wen, Jinsheng, Gu, G. D., Ding, Hong, & Shin, Shik. Observation of topological superconductivity on the surface of an iron-based superconductor. United States. https://doi.org/10.1126/science.aan4596
Zhang, Peng, Yaji, Koichiro, Hashimoto, Takahiro, Ota, Yuichi, Kondo, Takeshi, Okazaki, Kozo, Wang, Zhijun, Wen, Jinsheng, Gu, G. D., Ding, Hong, and Shin, Shik. Thu .
"Observation of topological superconductivity on the surface of an iron-based superconductor". United States. https://doi.org/10.1126/science.aan4596. https://www.osti.gov/servlets/purl/1440897.
@article{osti_1440897,
title = {Observation of topological superconductivity on the surface of an iron-based superconductor},
author = {Zhang, Peng and Yaji, Koichiro and Hashimoto, Takahiro and Ota, Yuichi and Kondo, Takeshi and Okazaki, Kozo and Wang, Zhijun and Wen, Jinsheng and Gu, G. D. and Ding, Hong and Shin, Shik},
abstractNote = {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 FeTe1–xSex (x = 0.45; superconducting transition temperature Tc = 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 Tc. Thus, our study shows that the surface states of FeTe0.55Se0.45 are topologically superconducting, providing a simple and possibly high-temperature platform for realizing Majorana states.},
doi = {10.1126/science.aan4596},
journal = {Science},
number = 6385,
volume = 360,
place = {United States},
year = {Thu Mar 08 00:00:00 EST 2018},
month = {Thu Mar 08 00:00:00 EST 2018}
}
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Figure 1: Band structure and topological superconductivity of FeTe0.5Se0.5. (A) Crystal structure of Fe(Te,Se), together with the 3D BZ and projected surface BZ. (B) In-plane BZ at kz = 0. There are two hole-like FSs at Γ and two electron-like FSs at M. The dashed circle at Γ indicates themore »
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- Lv, Baiqing; Qian, Tian; Ding, Hong
- arXiv
The three-dimensional electronic structure of the nematic and antiferromagnetic phases of NaFeAs from detwinned ARPES measurements
text, January 2017
- Watson, Matthew D.; Aswartham, Saicharan; Rhodes, Luke C.
- arXiv
Zero-energy bound states in the high-temperature superconductors at the two-dimensional limit
text, January 2018
- Liu, Chaofei; Chen, Cheng; Liu, Xiaoqiang
- arXiv
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