Electrical Tuning of the Excitonic Insulator Ground State of Ta2NiSe5
SCIE
SCOPUS
- Title
- Electrical Tuning of the Excitonic Insulator Ground State of Ta2NiSe5
- Authors
- Fukutani, Keisuke; Stania, Roland; Jung, Jiwon; Schwier, Eike F.; Shimada, Kenya; Kwon, Chang Il; Kim, Jun Sung; Yeom, Han Woong
- Date Issued
- 2019-11
- Publisher
- AMER PHYSICAL SOC
- Abstract
- We demonstrate that the excitonic insulator ground state of Ta2NiSe5 can be electrically controlled by electropositive surface adsorbates. Our studies utilizing angle-resolved photoemission spectroscopy reveal intriguing wave-vector-dependent deformations of the characteristic flattop valence band of this material upon potassium adsorption. The observed band deformation indicates a reduction of the single-particle band gap due to the Stark effect near the surface. The present study provides the foundation for the electrical tuning of the many-body quantum states in excitonic insulators.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/101118
- DOI
- 10.1103/PhysRevLett.123.206401
- ISSN
- 0031-9007
- Article Type
- Article
- Citation
- PHYSICAL REVIEW LETTERS, vol. 123, no. 20, 2019-11
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- There are no files associated with this item.
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