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I05-ARPES	Observation of topological surface states in the high-temperature superconductor MgB2 Xiaoqing Zhou , Kyle N. Gordon , Kyung-Hwan Jin , Haoxiang Li , Dushyant Narayan , Hengdi Zhao , Hao Zheng , Huaqing Huang , Gang Cao , Nikolai D. Zhigadlo , Feng Liu , Daniel Dessau Physical Review B 100 DOI: 10.1103/PhysRevB.100.184511 Diamond Proposal Number(s): [17595] Show Abstract ▼ 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.	Nov 2019

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