Photoinduced phase transition from excitonic insulator to semimetal-like state in Ta2Ni1−xCoxSe5 (x = 0.10)

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

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Abstract

We report time-resolved angle-resolved photoemission study on Ta2Ni1xCoxSe5 (x = 0.10) in which the excitonic insulator (EI) transition temperature is reduced by Co substitution for Ni. In the photoinduced phase, the conduction band is clearly observed and the energy gap between the conduction and valence bands is undetectably small within the energy resolution. Assuming that the energy gap is closed, the conduction band crosses or overlaps with the valence band near the Fermi level resembling a nodal semimetal.

Original languageEnglish
Article number124703
Journaljournal of the physical society of japan
Volume89
Issue number12
DOIs
Publication statusPublished - Dec 15 2020

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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