Surface Electronic Structure Engineering of Manganese Bismuth Tellurides Guided by Micro-Focused Angle-Resolved Photoemission.

Autor: Volckaert K; Department of Physics and Astronomy, Interdisciplinary Nanoscience Center, Aarhus University, Aarhus C, 8000, Denmark., Majchrzak P; Department of Physics and Astronomy, Interdisciplinary Nanoscience Center, Aarhus University, Aarhus C, 8000, Denmark., Biswas D; Department of Physics and Astronomy, Interdisciplinary Nanoscience Center, Aarhus University, Aarhus C, 8000, Denmark., Jones AJH; Department of Physics and Astronomy, Interdisciplinary Nanoscience Center, Aarhus University, Aarhus C, 8000, Denmark., Bianchi M; Department of Physics and Astronomy, Interdisciplinary Nanoscience Center, Aarhus University, Aarhus C, 8000, Denmark., Jiang Z; Department of Physics and Astronomy, Interdisciplinary Nanoscience Center, Aarhus University, Aarhus C, 8000, Denmark., Dubourg R; Department of Physics and Astronomy, Interdisciplinary Nanoscience Center, Aarhus University, Aarhus C, 8000, Denmark., Stenshøj RØ; Department of Physics and Astronomy, Interdisciplinary Nanoscience Center, Aarhus University, Aarhus C, 8000, Denmark., Jensen ML; Department of Physics and Astronomy, Interdisciplinary Nanoscience Center, Aarhus University, Aarhus C, 8000, Denmark., Jones NC; Department of Physics and Astronomy, Interdisciplinary Nanoscience Center, Aarhus University, Aarhus C, 8000, Denmark., Hoffmann SV; Department of Physics and Astronomy, Interdisciplinary Nanoscience Center, Aarhus University, Aarhus C, 8000, Denmark., Mi JL; Department of Chemistry, Interdisciplinary Nanoscience Center, Aarhus University, Aarhus C, 8000, Denmark., Bremholm M; Department of Chemistry, Interdisciplinary Nanoscience Center, Aarhus University, Aarhus C, 8000, Denmark., Pan XC; Advanced Institute for Materials Research, Tohoku University, Sendai, 980-8577, Japan., Chen YP; Department of Physics and Astronomy, Interdisciplinary Nanoscience Center, Aarhus University, Aarhus C, 8000, Denmark.; Advanced Institute for Materials Research, Tohoku University, Sendai, 980-8577, Japan.; Department of Physics and Astronomy and School of Electrical and Computer Engineering and Purdue Quantum Science and Engineering Institute, Purdue University, West Lafayette, IN, 47907, USA., Hofmann P; Department of Physics and Astronomy, Interdisciplinary Nanoscience Center, Aarhus University, Aarhus C, 8000, Denmark., Miwa JA; Department of Physics and Astronomy, Interdisciplinary Nanoscience Center, Aarhus University, Aarhus C, 8000, Denmark., Ulstrup S; Department of Physics and Astronomy, Interdisciplinary Nanoscience Center, Aarhus University, Aarhus C, 8000, Denmark.
Jazyk: angličtina
Zdroj: Advanced materials (Deerfield Beach, Fla.) [Adv Mater] 2023 Sep; Vol. 35 (36), pp. e2301907. Date of Electronic Publication: 2023 Jul 21.
DOI: 10.1002/adma.202301907
Abstrakt: Modification of the electronic structure of quantum matter by ad atom deposition allows for directed fundamental design of electronic and magnetic properties. This concept is utilized in the present study in order to tune the surface electronic structure of magnetic topological insulators based on MnBi 2 Te 4 . The topological bands of these systems are typically strongly electron-doped and hybridized with a manifold of surface states that place the salient topological states out of reach of electron transport and practical applications. In this study, micro-focused angle-resolved photoemission spectroscopy (microARPES) provides direct access to the termination-dependent dispersion of MnBi 2 Te 4 and MnBi 4 Te 7 during in situ deposition of rubidium atoms. The resulting band structure changes are found to be highly complex, encompassing coverage-dependent ambipolar doping effects, removal of surface state hybridization, and the collapse of a surface state band gap. In addition, doping-dependent band bending is found to give rise to tunable quantum well states. This wide range of observed electronic structure modifications can provide new ways to exploit the topological states and the rich surface electronic structures of manganese bismuth tellurides.
(© 2023 The Authors. Advanced Materials published by Wiley-VCH GmbH.)
Databáze: MEDLINE
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