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Keisuke Fukutani
원자제어 저차원 전자계 연구단
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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
URI
https://pr.ibs.re.kr/handle/8788114/6772
ISSN
0031-9007
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > Journal Papers (저널논문)
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[대표]2019_PRL_Keisuke(제1저자),단장(교신)_Electrical Tuning of the Excitonic Insulator Ground State of Ta2NiSe5.pdfDownload

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