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Anomalous excitonic phase diagram in band-gap-tuned Ta2Ni(Se,S)5

Author

Listed:
  • Cheng Chen

    (University of Oxford
    Yale University)

  • Weichen Tang

    (University of California
    Lawrence Berkeley National Lab)

  • Xiang Chen

    (University of California
    Lawrence Berkeley National Lab)

  • Zhibo Kang

    (Yale University)

  • Shuhan Ding

    (Clemson University)

  • Kirsty Scott

    (Yale University)

  • Siqi Wang

    (Yale University)

  • Zhenglu Li

    (University of California
    Lawrence Berkeley National Lab
    University of Southern California)

  • Jacob P. C. Ruff

    (Cornell University)

  • Makoto Hashimoto

    (SLAC National Accelerator Laboratory)

  • Dong-Hui Lu

    (SLAC National Accelerator Laboratory)

  • Chris Jozwiak

    (Lawrence Berkeley National Laboratory)

  • Aaron Bostwick

    (Lawrence Berkeley National Laboratory)

  • Eli Rotenberg

    (Lawrence Berkeley National Laboratory)

  • Eduardo H. Silva Neto

    (Yale University)

  • Robert J. Birgeneau

    (University of California
    Lawrence Berkeley National Lab
    University of California)

  • Yulin Chen

    (University of Oxford)

  • Steven G. Louie

    (University of California
    Lawrence Berkeley National Lab)

  • Yao Wang

    (Clemson University
    Emory University)

  • Yu He

    (Yale University)

Abstract

During a band-gap-tuned semimetal-to-semiconductor transition, Coulomb attraction between electrons and holes can cause spontaneously formed excitons near the zero-band-gap point, or the Lifshitz transition point. This has become an important route to realize bulk excitonic insulators – an insulating ground state distinct from single-particle band insulators. How this route manifests from weak to strong coupling is not clear. In this work, using angle-resolved photoemission spectroscopy (ARPES) and high-resolution synchrotron x-ray diffraction (XRD), we investigate the broken symmetry state across the semimetal-to-semiconductor transition in a leading bulk excitonic insulator candidate system Ta2Ni(Se,S)5. A broken symmetry phase is found to be continuously suppressed from the semimetal side to the semiconductor side, contradicting the anticipated maximal excitonic instability around the Lifshitz transition. Bolstered by first-principles and model calculations, we find strong interband electron-phonon coupling to play a crucial role in the enhanced symmetry breaking on the semimetal side of the phase diagram. Our results not only provide insight into the longstanding debate of the nature of intertwined orders in Ta2NiSe5, but also establish a basis for exploring band-gap-tuned structural and electronic instabilities in strongly coupled systems.

Suggested Citation

  • 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.
  • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-43365-1
    DOI: 10.1038/s41467-023-43365-1
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    References listed on IDEAS

    as
    1. 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.
    2. Y. F. Lu & H. Kono & T. I. Larkin & A. W. Rost & T. Takayama & A. V. Boris & B. Keimer & H. Takagi, 2017. "Zero-gap semiconductor to excitonic insulator transition in Ta2NiSe5," Nature Communications, Nature, vol. 8(1), pages 1-7, April.
    3. M. Yi & Y. Zhang & Z.-K. Liu & X. Ding & J.-H. Chu & A.F. Kemper & N. Plonka & B. Moritz & M. Hashimoto & S.-K. Mo & Z. Hussain & T.P. Devereaux & I.R. Fisher & H.H. Wen & Z.-X. Shen & D.H. Lu, 2014. "Dynamic competition between spin-density wave order and superconductivity in underdoped Ba1−xKxFe2As2," Nature Communications, Nature, vol. 5(1), pages 1-7, September.
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