Photoemission spectroscopy of Ta 2NiSe 5

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

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

We report temperature-dependent angle-resolved photoemission spectroscopy measurement of Ta 2NiSe 5 which shows a semiconductor- semiconductor structural phase transition at around 330 K. Characteristically, flat band at the top of the valence band is observed, which is ascribed to the excitonic insulator effect. The top valence band shifts to higher binding energy and its bandwidth increases as the temperature decreases. As the system exceeds the transition temperature, the flat feature of the valence band weakens though the exciton fluctuations remain finite.

Original languageEnglish
Pages (from-to)1231-1234
Number of pages4
JournalJournal of Superconductivity and Novel Magnetism
Volume25
Issue number5
DOIs
Publication statusPublished - Jul 2012
Externally publishedYes

Fingerprint

Photoelectron spectroscopy
Valence bands
photoelectric emission
valence
Semiconductor materials
spectroscopy
Binding energy
Excitons
Superconducting transition temperature
Phase transitions
Bandwidth
Temperature
binding energy
transition temperature
excitons
insulators
bandwidth
temperature
shift

Keywords

  • Excitonic insulator
  • Layered chalcogenide
  • Photoemission

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Wakisaka, Y., Sudayama, T., Takubo, K., Mizokawa, T., Saini, N. L., Arita, M., ... Takagi, H. (2012). Photoemission spectroscopy of Ta 2NiSe 5 Journal of Superconductivity and Novel Magnetism, 25(5), 1231-1234. https://doi.org/10.1007/s10948-012-1526-0

Photoemission spectroscopy of Ta 2NiSe 5 . / Wakisaka, Y.; Sudayama, T.; Takubo, K.; Mizokawa, T.; Saini, N. L.; Arita, M.; Namatame, H.; Taniguchi, M.; Katayama, N.; Nohara, Minoru; Takagi, H.

In: Journal of Superconductivity and Novel Magnetism, Vol. 25, No. 5, 07.2012, p. 1231-1234.

Research output: Contribution to journalArticle

Wakisaka, Y, Sudayama, T, Takubo, K, Mizokawa, T, Saini, NL, Arita, M, Namatame, H, Taniguchi, M, Katayama, N, Nohara, M & Takagi, H 2012, 'Photoemission spectroscopy of Ta 2NiSe 5 ', Journal of Superconductivity and Novel Magnetism, vol. 25, no. 5, pp. 1231-1234. https://doi.org/10.1007/s10948-012-1526-0
Wakisaka Y, Sudayama T, Takubo K, Mizokawa T, Saini NL, Arita M et al. Photoemission spectroscopy of Ta 2NiSe 5 Journal of Superconductivity and Novel Magnetism. 2012 Jul;25(5):1231-1234. https://doi.org/10.1007/s10948-012-1526-0
Wakisaka, Y. ; Sudayama, T. ; Takubo, K. ; Mizokawa, T. ; Saini, N. L. ; Arita, M. ; Namatame, H. ; Taniguchi, M. ; Katayama, N. ; Nohara, Minoru ; Takagi, H. / Photoemission spectroscopy of Ta 2NiSe 5 In: Journal of Superconductivity and Novel Magnetism. 2012 ; Vol. 25, No. 5. pp. 1231-1234.
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