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Photoemission Spectroscopy of Ta2NiSe5Journal of Superconductivity and Novel Magnetism, 25
- Publisher
- Wiley
- Copyright
- © 2023 Wiley‐VCH GmbH
- eISSN
- 2511-9044
- DOI
- 10.1002/qute.202300034
- Publisher site
- See Article on Publisher Site
Abstract
Electronic properties of various insulators can be controlled by chemical substitution. For example, exotic superconducting phases are often obtained by chemical substitution in Mott insulators. Compared to Mott insulators, impact of chemical substitution on excitonic insulators is not well explored yet. In the present work, space‐resolved angle‐resolved photoemission spectroscopy of the model Ta2Ni(Se1‐xSx)5 is reported in which S substitution for Se is used to control the excitonic behavior. The substitution introduces electronic inhomogeneity with the Se 4p/S 3p valence band exhibiting strong position dependence. In contrast, the flat top valence band, which is a signature of the excitonic insulating phase, does not show any appreciable position dependence except the effect of surface corrugation. This indicates that the excitonic coupling in Ta2NiSe5 is robust against the electronic inhomogeneity induced by the S substitution.
Journal
Advanced Quantum Technologies – Wiley
Published: Jun 1, 2023
Keywords: electronic inhomogeneity; excitonic insulator; transition‐metal chalcogenide