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, Minoru Nohara, H. Takagi

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Abstract

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.

Original languageEnglish
Article number026402
JournalPhysical Review Letters
Volume103
Issue number2
DOIs
Publication statusPublished - Aug 6 2009

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photoelectric emission
insulators
ground state
spectroscopy
valence
electrons

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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Wakisaka, Y., Sudayama, T., Takubo, K., Mizokawa, T., Arita, M., Namatame, H., ... Takagi, H. (2009). Excitonic insulator state in Ta2NiSe5 probed by photoemission spectroscopy. Physical Review Letters, 103(2), [026402]. https://doi.org/10.1103/PhysRevLett.103.026402

Excitonic insulator state in Ta2NiSe5 probed by photoemission spectroscopy. / Wakisaka, Y.; Sudayama, T.; Takubo, K.; Mizokawa, T.; Arita, M.; Namatame, H.; Taniguchi, M.; Katayama, N.; Nohara, Minoru; Takagi, H.

In: Physical Review Letters, Vol. 103, No. 2, 026402, 06.08.2009.

Research output: Contribution to journalArticle

Wakisaka, Y, Sudayama, T, Takubo, K, Mizokawa, T, Arita, M, Namatame, H, Taniguchi, M, Katayama, N, Nohara, M & Takagi, H 2009, 'Excitonic insulator state in Ta2NiSe5 probed by photoemission spectroscopy', Physical Review Letters, vol. 103, no. 2, 026402. https://doi.org/10.1103/PhysRevLett.103.026402
Wakisaka Y, Sudayama T, Takubo K, Mizokawa T, Arita M, Namatame H et al. Excitonic insulator state in Ta2NiSe5 probed by photoemission spectroscopy. Physical Review Letters. 2009 Aug 6;103(2). 026402. https://doi.org/10.1103/PhysRevLett.103.026402
Wakisaka, Y. ; Sudayama, T. ; Takubo, K. ; Mizokawa, T. ; Arita, M. ; Namatame, H. ; Taniguchi, M. ; Katayama, N. ; Nohara, Minoru ; Takagi, H. / Excitonic insulator state in Ta2NiSe5 probed by photoemission spectroscopy. In: Physical Review Letters. 2009 ; Vol. 103, No. 2.
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