Strong interband interaction in the excitonic insulator phase of Ta2NiSe5

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Title
Strong interband interaction in the excitonic insulator phase of Ta2NiSe5
Author(s)
Jinwon Lee; Kang C.-J.; Eom M.J.; Jun Sung Kim; Min B.I.; Han Woong Yeom
Publication Date
2019-02
Journal
PHYSICAL REVIEW B, v.99, no.7, pp.075408 -
Publisher
AMER PHYSICAL SOC
Abstract
Excitonic insulator (EI) was proposed in the 1960s as a distinct insulating state originating from pure electronic interaction, but its material realization has been elusive with extremely few material candidates and with only limited evidence such as anomalies in transport properties, band dispersions, or optical transitions. We investigate the real-space electronic states of the low-temperature phase in Ta2NiSe5 with atomic resolution to clearly identify the quasiparticle energy gap together with the strong electron-hole band renormalization using scanning tunneling microscopy and spectroscopy (STS). These results are in good agreement with the EI transition scenario in Ta2NiSe5. Our spatially resolved STS data and theoretical calculations reveal further the orbital inversion at band edges, which indicates the exciton condensation close to the Bardeen-Cooper-Schrieffer regime. © 2019 American Physical Society
URI
https://pr.ibs.re.kr/handle/8788114/6025
ISSN
2469-9950
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > Journal Papers (저널논문)
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190206_PhysRevB.99.075408_단장(교신)Strong interband interaction in the excitonic insulator phase of Ta2NiSe5.pdfDownload

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