Excitonic insulator state in Ta2NiSe5 probed by photoemission spectroscopy

Y. Wakisaka*, T. Sudayama, K. Takubo, T. Mizokawa, M. Arita, H. Namatame, M. Taniguchi, N. Katayama, M. Nohara, H. Takagi

*この研究の対応する著者

研究成果査読

154 被引用数 (Scopus)

抄録

We report on a photoemission study of Ta2NiSe5 that has a quasi-one-dimensional structure and an insulating ground state. Ni 2p core-level spectra show that the Ni 3d subshell is partially occupied and the Ni 3d states are heavily hybridized with the Se 4p states. In angle-resolved photoemission spectra, the valence-band top is found to be extremely flat, indicating that the ground state can be viewed as an excitonic insulator state between the Ni 3d-Se 4p hole and the Ta 5d electron. We argue that the high atomic polarizability of Se plays an important role to stabilize the excitonic state.

本文言語English
論文番号026402
ジャーナルPhysical Review Letters
103
2
DOI
出版ステータスPublished - 2009 8 6
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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