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Observation of topological surface states in the high-temperature superconductor MgB2
DOI:
10.1103/PhysRevB.100.184511
Authors:
Xiaoqing
Zhou
(University of Colorado at Boulder)
,
Kyle N.
Gordon
(University of Colorado Boulder)
,
Kyung-Hwan
Jin
(University of Utah)
,
Haoxiang
Li
(University of Colorado at Boulder)
,
Dushyant
Narayan
(University of Colorado at Boulder)
,
Hengdi
Zhao
(University of Colorado at Boulder)
,
Hao
Zheng
(University of Colorado at Boulder)
,
Huaqing
Huang
(University of Utah)
,
Gang
Cao
(University of Colorado at Boulder)
,
Nikolai D.
Zhigadlo
(University of Bern; CrystMat Company)
,
Feng
Liu
(University of Utah; Collaborative Innovation Center of Quantum Matter, Beijing)
,
Daniel
Dessau
(University of Colorado at Boulder)
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
Physical Review B
, VOL 100
State:
Published (Approved)
Published:
November 2019
Diamond Proposal Number(s):
17595
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 MgB 2 . 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.
Journal Keywords: Topological superconductors; Angle-resolved photoemission spectroscopy; Density functional calculations; Condensed Matter & Materials Physics
Subject Areas:
Materials,
Physics
Instruments:
I05-ARPES
Other Facilities: Stanford Synchrotron Radiation Lightsource
Added On:
05/12/2019 12:09
Discipline Tags:
Surfaces
Superconductors
Quantum Materials
Hard condensed matter - electronic properties
Physics
Materials Science
Technical Tags:
Spectroscopy
Angle Resolved Photoemission Spectroscopy (ARPES)