Surface charge induced Dirac band splitting in a charge density wave material ( Ta Se 4 ) 2 I

Yi, Hemian; Huang, Zengle; Shi, Wujun; Min, Lujin; Wu, Rui; Polley, C. M.; Zhang, Ruoxi; Zhao, Yi-Fan; Zhou, Ling-Jie; Adell, J.; Gui, Xin; Xie, Weiwei; Chan, Moses H. W.; Mao, Zhiqiang; Wang, Zhijun; Wu, Weida; Chang, Cui-Zu

doi:10.1103/PhysRevResearch.3.013271

Title: Surface charge induced Dirac band splitting in a charge density wave material ${(Ta {Se}_{4})}_{2} I$

Journal Article · Tue Mar 23 00:00:00 EDT 2021 · Physical Review Research

DOI:https://doi.org/10.1103/PhysRevResearch.3.013271· OSTI ID:1772266

Yi, Hemian;

; Shi, Wujun;

; Wu, Rui; Polley, C. M.; Zhang, Ruoxi; Zhao, Yi-Fan; Zhou, Ling-Jie;

; Gui, Xin; Xie, Weiwei; Chan, Moses H. W.; Mao, Zhiqiang;

;

(TaSe₄)₂I, a quasi-one-dimensional (1D) crystal, shows a characteristic temperature-driven metal-insulator phase transition. Above the charge density wave (CDW) temperature T_c, (TaSe₄)₂I has been predicted to harbor a Weyl semimetal phase. Below T_c, it becomes an axion insulator. Here, we performed angle-resolved photoemission spectroscopy measurements on the (110) surface of (TaSe₄)₂I and observed two sets of Dirac-like energy bands in the first Brillouin zone, which agree well with our first-principles calculations. Moreover, we found that each Dirac band exhibits an energy splitting of hundreds of millielectron volts under certain circumstances. In combination with core level measurements, our theoretical analysis showed that this Dirac band splitting is a result of surface charge polarization due to the loss of surface iodine atoms. Our findings here shed light on the interplay between band topology and CDW order in Peierls compounds and will motivate more studies on topological properties of strongly correlated quasi-1D materials.

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Research Organization:: Pennsylvania State Univ., University Park, PA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0019064; AC02-76SF00515

OSTI ID:: 1772266

Alternate ID(s):: OSTI ID: 1783183

Journal Information:: Physical Review Research, Journal Name: Physical Review Research Vol. 3 Journal Issue: 1; ISSN 2643-1564

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Surface charge induced Dirac band splitting in a charge density wave material ( Ta Se 4 ) 2 I

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Title: Surface charge induced Dirac band splitting in a charge density wave material ${(Ta {Se}_{4})}_{2} I$