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Title: Observation of topological surface states in the high-temperature superconductor MgB2

Abstract

Most topological superconductors known to date suffer from low transition temperatures ($$T_c$$) and/or high fragility to disorder and dopant levels, which is hampering the progress in this promising field. Here, utilizing a combination of angle-resolved photoemission spectroscopy measurements and density-functional theory calculations, we show the presence of a type of topological Dirac nodal line surface state on the [010] faces of the $$T_c$$ = 39 K BCS superconductor MgB2. This surface state should be highly tolerant against disorder and inadvertent doping variations and is expected to go superconducting via the proximity effect to the bulk superconductor that this state is intimately connected to. We report this would represent a form of high-temperature topological superconductivity.

Authors:
 [1];  [1];  [2];  [1];  [1];  [1];  [1];  [2];  [1]; ORCiD logo [3];  [4];  [1]
+ Show Author Affiliations
  1. Univ. of Colorado, Boulder, CO (United States)
  2. Univ. of Utah, Salt Lake City, UT (United States)
  3. Univ. of Bern (Switzerland); CrystMat Company, Zurich (Switzerland)
  4. Univ. of Utah, Salt Lake City, UT (United States); Collaborative Innovation Center of Quantum Matter, Beijing (China)
Publication Date:
Research Org.:
Univ. of Colorado, Boulder, CO (United States); Univ. of Utah, Salt Lake City, UT (United States); Univ. of California, Oakland, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
OSTI Identifier:
1800130
Grant/Contract Number:  
FG02-03ER46066; FG02-04ER46148; AC02-05CH11231; DMR 1712101; DMR 1903888
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 100; Journal Issue: 18; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Materials Science; Physics

Citation Formats

Zhou, Xiaoqing, Gordon, Kyle N., Jin, Kyung-Hwan, Li, Haoxiang, Narayan, Dushyant, Zhao, Hengdi, Zheng, Hao, Huang, Huaqing, Cao, Gang, Zhigadlo, Nikolai D., Liu, Feng, and Dessau, Daniel S. Observation of topological surface states in the high-temperature superconductor MgB2. United States: N. p., 2019. Web. doi:10.1103/physrevb.100.184511.
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Zhou, Xiaoqing, Gordon, Kyle N., Jin, Kyung-Hwan, Li, Haoxiang, Narayan, Dushyant, Zhao, Hengdi, Zheng, Hao, Huang, Huaqing, Cao, Gang, Zhigadlo, Nikolai D., Liu, Feng, & Dessau, Daniel S. Observation of topological surface states in the high-temperature superconductor MgB2. United States. https://doi.org/10.1103/physrevb.100.184511
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Zhou, Xiaoqing, Gordon, Kyle N., Jin, Kyung-Hwan, Li, Haoxiang, Narayan, Dushyant, Zhao, Hengdi, Zheng, Hao, Huang, Huaqing, Cao, Gang, Zhigadlo, Nikolai D., Liu, Feng, and Dessau, Daniel S. Thu . "Observation of topological surface states in the high-temperature superconductor MgB2". United States. https://doi.org/10.1103/physrevb.100.184511. https://www.osti.gov/servlets/purl/1800130.
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@article{osti_1800130,
title = {Observation of topological surface states in the high-temperature superconductor MgB2},
author = {Zhou, Xiaoqing and Gordon, Kyle N. and Jin, Kyung-Hwan and Li, Haoxiang and Narayan, Dushyant and Zhao, Hengdi and Zheng, Hao and Huang, Huaqing and Cao, Gang and Zhigadlo, Nikolai D. and Liu, Feng and Dessau, Daniel S.},
abstractNote = {Most topological superconductors known to date suffer from low transition temperatures ($T_c$) and/or high fragility to disorder and dopant levels, which is hampering the progress in this promising field. Here, utilizing a combination of angle-resolved photoemission spectroscopy measurements and density-functional theory calculations, we show the presence of a type of topological Dirac nodal line surface state on the [010] faces of the $T_c$ = 39 K BCS superconductor MgB2. This surface state should be highly tolerant against disorder and inadvertent doping variations and is expected to go superconducting via the proximity effect to the bulk superconductor that this state is intimately connected to. We report this would represent a form of high-temperature topological superconductivity.},
doi = {10.1103/physrevb.100.184511},
journal = {Physical Review B},
number = 18,
volume = 100,
place = {United States},
year = {Thu Nov 21 00:00:00 EST 2019},
month = {Thu Nov 21 00:00:00 EST 2019}
}
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https://doi.org/10.1103/physrevb.100.184511
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