Photo-induced semimetallic states realised in electron–hole coupled insulators

Kozo Okazaki (), Yu Ogawa, Takeshi Suzuki, Takashi Yamamoto, Takashi Someya, Shoya Michimae, Mari Watanabe, Yangfan Lu, Minoru Nohara, Hidenori Takagi, Naoyuki Katayama, Hiroshi Sawa, Masami Fujisawa, Teruto Kanai, Nobuhisa Ishii, Jiro Itatani, Takashi Mizokawa and Shik Shin ()
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Kozo Okazaki: University of Tokyo
Yu Ogawa: University of Tokyo
Takeshi Suzuki: University of Tokyo
Takashi Yamamoto: University of Tokyo
Takashi Someya: University of Tokyo
Shoya Michimae: University of Tokyo
Mari Watanabe: University of Tokyo
Yangfan Lu: University of Tokyo
Minoru Nohara: Okayama University
Hidenori Takagi: University of Tokyo
Naoyuki Katayama: Nagoya University
Hiroshi Sawa: Nagoya University
Masami Fujisawa: University of Tokyo
Teruto Kanai: University of Tokyo
Nobuhisa Ishii: University of Tokyo
Jiro Itatani: University of Tokyo
Takashi Mizokawa: Waseda University
Shik Shin: University of Tokyo

Nature Communications, 2018, vol. 9, issue 1, 1-6

Abstract: Abstract Using light to manipulate materials into desired states is one of the goals in condensed matter physics, since light control can provide ultrafast and environmentally friendly photonics devices. However, it is generally difficult to realise a photo-induced phase which is not merely a higher entropy phase corresponding to a high-temperature phase at equilibrium. Here, we report realisation of photo-induced insulator-to-metal transitions in Ta2Ni(Se1−xSx)5 including the excitonic insulator phase using time- and angle-resolved photoemission spectroscopy. From the dynamic properties of the system, we determine that screening of excitonic correlations plays a key role in the timescale of the transition to the metallic phase, which supports the existence of an excitonic insulator phase at equilibrium. The non-equilibrium metallic state observed unexpectedly in the direct-gap excitonic insulator opens up a new avenue to optical band engineering in electron–hole coupled systems.

Date: 2018
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DOI: 10.1038/s41467-018-06801-1

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