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

Author

Listed:
  • 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
    Max Planck Institute for Solid State Research)

  • 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)

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.

Suggested Citation

  • 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 , 2018. "Photo-induced semimetallic states realised in electron–hole coupled insulators," Nature Communications, Nature, vol. 9(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-06801-1
    DOI: 10.1038/s41467-018-06801-1
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