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IBS Publications RepositoryCenter for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단)1. Journal Papers (저널논문)
Electrical Tuning of the Excitonic Insulator Ground State of Ta2NiSe5
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- Title
- Electrical Tuning of the Excitonic Insulator Ground State of Ta2NiSe5
- Author(s)
- Keisuke Fukutani; Roland Stania; Jiwon Jung; Schwier, EF; Shimada, K; Chang Il Kwon; Jun Sung Kim; Han Woong Yeom
- Publication Date
- 2019-11
- Journal
- PHYSICAL REVIEW LETTERS, v.123, no.20, pp.206401
- 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. © 2019 American Physical Society
- ISSN
- 0031-9007
- Appears in Collections:
- Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > 1. Journal Papers (저널논문)
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