Quasi One-Dimensional Band Structure of Photoinduced Semimetal Phase of Ta2Ni1−xCoxSe5 (x = 0.0 and 0.1)

Takumi Mitsuoka, Yu Takahashi, Takeshi Suzuki, Mario Okawa, Hidenori Takagi, Naoyuki Katayama, Hiroshi Sawa, Minoru Nohara, Mari Watanabe, Jiadi Xu, Qianhui Ren, Masami Fujisawa, Teruto Kanai, Jiro Itatani, Kozo Okazaki, Shik Shin, Takashi Mizokawa

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1 Citation (Scopus)

Abstract

The photoinduced semimetal phase of Ta2Ni1−xCoxSe5 (x = 0.0 and 0.1) is studied by time-resolved angle-resolved photoemission spectroscopy. The observed band dispersions roughly agree with the generalized gradient approximation (GGA) calculation which fails to reproduce the band gap at the ambient condition. This suggests that the electron–hole interaction, which is not exactly included in GGA, is screened out by the photoexcited carriers. There is no indication of pseudogap. The conduction and valence bands provide quasi one-dimensional Fermi surfaces with similar momentum positions suggesting a quasi one-dimensional line-node semimetal.

Original languageEnglish
Article number023703
Journaljournal of the physical society of japan
Volume92
Issue number2
DOIs
Publication statusPublished - 2023 Feb 15

ASJC Scopus subject areas

  • General Physics and Astronomy

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