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Ultrafast melting and recovery of collective order in the excitonic insulator Ta2NiSe5

Author

Listed:
  • Hope M. Bretscher

    (University of Cambridge)

  • Paolo Andrich

    (University of Cambridge)

  • Prachi Telang

    (Indian Institute of Science Education and Research)

  • Anupam Singh

    (Indian Institute of Science Education and Research)

  • Luminita Harnagea

    (Indian Institute of Science Education and Research)

  • A. K. Sood

    (Indian Institute of Science)

  • Akshay Rao

    (University of Cambridge)

Abstract

The layered chalcogenide Ta2NiSe5 has been proposed to host an excitonic condensate in its ground state, a phase that could offer a unique platform to study and manipulate many-body states at room temperature. However, identifying the dominant microscopic contribution to the observed spontaneous symmetry breaking remains challenging, perpetuating the debate over the ground state properties. Here, using broadband ultrafast spectroscopy we investigate the out-of-equilibrium dynamics of Ta2NiSe5 and demonstrate that the transient reflectivity in the near-infrared range is connected to the system’s low-energy physics. We track the status of the ordered phase using this optical signature, establishing that high-fluence photoexcitations can suppress this order. From the sub-50 fs quenching timescale and the behaviour of the photoinduced coherent phonon modes, we conclude that electronic correlations provide a decisive contribution to the excitonic order formation. Our results pave the way towards the ultrafast control of an exciton condensate at room temperature.

Suggested Citation

  • Hope M. Bretscher & Paolo Andrich & Prachi Telang & Anupam Singh & Luminita Harnagea & A. K. Sood & Akshay Rao, 2021. "Ultrafast melting and recovery of collective order in the excitonic insulator Ta2NiSe5," Nature Communications, Nature, vol. 12(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-21929-3
    DOI: 10.1038/s41467-021-21929-3
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    Cited by:

    1. Cheng Chen & Weichen Tang & Xiang Chen & Zhibo Kang & Shuhan Ding & Kirsty Scott & Siqi Wang & Zhenglu Li & Jacob P. C. Ruff & Makoto Hashimoto & Dong-Hui Lu & Chris Jozwiak & Aaron Bostwick & Eli Rot, 2023. "Anomalous excitonic phase diagram in band-gap-tuned Ta2Ni(Se,S)5," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
    2. H. M. Yoo & M. Korkusinski & D. Miravet & K. W. Baldwin & K. West & L. Pfeiffer & P. Hawrylak & R. C. Ashoori, 2023. "Time, momentum, and energy resolved pump-probe tunneling spectroscopy of two-dimensional electron systems," Nature Communications, Nature, vol. 14(1), pages 1-6, December.

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