Journal
PHYSICAL REVIEW LETTERS
Volume 123, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.123.206401
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Funding
- Institute for Basic Science (IBS), Korea [IBS-R014-D01]
- National Research Foundation of Korea (NRF) through the SRC [2018R1A5A6075964]
- Max Planck-POSTECH Center [2016K1A4A4A01922028]
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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.
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