The effect of spin-orbit coupling on nonsymmorphic square-net compounds
| Autor: | Andrei Varykhalov, Bettina V. Lotsch, Andreas Topp, M. Krivenkov, Leslie M. Schoop, Christian R. Ast, Maia G. Vergniory, Fanny Rodolakis, Jessica L. McChesney |
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| Rok vydání: | 2019 |
| Předmět: |
Coupling
Physics Field (physics) Condensed matter physics Dirac (software) Degenerate energy levels 02 engineering and technology General Chemistry Spin–orbit interaction 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences General Materials Science Density functional theory 0210 nano-technology Electronic band structure Degeneracy (mathematics) |
| Zdroj: | Journal of Physics and Chemistry of Solids. 128:296-300 |
| ISSN: | 0022-3697 |
| Popis: | In the field of Dirac materials, spin-orbit coupling (SOC) is usually considered disruptive, since it may lift degeneracies that are not protected by high-symmetry elements. Nonsymmorphic symmetries force degenerate points in the band structure at high-symmetry points that are not disrupted by SOC. The degeneracy is, however, often protected along whole high-symmetry lines or faces resulting in highly anisotropic crossings or nodal lines, which can considerably limit the region, in which the bands are linearly dispersed. It has been theoretically suggested that SOC could circumvent this problem. Here, we show experimentally that SOC can lift the extended protection in nonsymmorphic square-net compounds. We compare ZrSiS and CeSbTe , two materials with drastically different SOC, to show the effect of SOC on the band structure by means of angle-resolved photoemission spectroscopy and density functional theory calculations. |
| Databáze: | OpenAIRE |
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