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

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. (2019). Observation of topological surface states in the high-temperature superconductor MgB2. Physical review. B - condensed matter and materials physics, 100(18) American Physical Society 10.1103/PhysRevB.100.184511

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Most topological superconductors known to date suffer from low transition temperatures (Tc) 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 Tc=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. This would represent a form of high-temperature topological superconductivity.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Departement of Chemistry and Biochemistry

UniBE Contributor:

Zhigadlo, Nikolai

Subjects:

500 Science > 570 Life sciences; biology
500 Science > 540 Chemistry

ISSN:

1098-0121

Publisher:

American Physical Society

Language:

English

Submitter:

Franziska Bornhauser-Rufer

Date Deposited:

27 Feb 2020 10:28

Last Modified:

27 Feb 2020 10:38

Publisher DOI:

10.1103/PhysRevB.100.184511

BORIS DOI:

10.7892/boris.140697

URI:

https://boris.unibe.ch/id/eprint/140697

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