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Spectral signatures of a unique charge density wave in Ta2NiSe7

Author

Listed:
  • Matthew D. Watson

    (Diamond Light Source Ltd)

  • Alex Louat

    (Diamond Light Source Ltd)

  • Cephise Cacho

    (Diamond Light Source Ltd)

  • Sungkyun Choi

    (Institute for Basic Science (IBS)
    Sungkyunkwan University)

  • Young Hee Lee

    (Institute for Basic Science (IBS)
    Sungkyunkwan University)

  • Michael Neumann

    (Institute for Basic Science (IBS)
    Sungkyunkwan University)

  • Gideok Kim

    (Institute for Basic Science (IBS)
    Sungkyunkwan University)

Abstract

Charge Density Waves (CDW) are commonly associated with the presence of near-Fermi level states which are separated from others, or “nested", by a wavector of q. Here we use Angle-Resolved Photo Emission Spectroscopy (ARPES) on the CDW material Ta2NiSe7 and identify a total absence of any plausible nesting of states at the primary CDW wavevector q. Nevertheless we observe spectral intensity on replicas of the hole-like valence bands, shifted by a wavevector of q, which appears with the CDW transition. In contrast, we find that there is a possible nesting at 2q, and associate the characters of these bands with the reported atomic modulations at 2q. Our comprehensive electronic structure perspective shows that the CDW-like transition of Ta2NiSe7 is unique, with the primary wavevector q being unrelated to any low-energy states, but suggests that the reported modulation at 2q, which would plausibly connect low-energy states, might be more important for the overall energetics of the problem.

Suggested Citation

  • Matthew D. Watson & Alex Louat & Cephise Cacho & Sungkyun Choi & Young Hee Lee & Michael Neumann & Gideok Kim, 2023. "Spectral signatures of a unique charge density wave in Ta2NiSe7," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-39114-z
    DOI: 10.1038/s41467-023-39114-z
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    References listed on IDEAS

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    1. Camiel Efferen & Jan Berges & Joshua Hall & Erik Loon & Stefan Kraus & Arne Schobert & Tobias Wekking & Felix Huttmann & Eline Plaar & Nico Rothenbach & Katharina Ollefs & Lucas Machado Arruda & Nick , 2021. "A full gap above the Fermi level: the charge density wave of monolayer VS2," Nature Communications, Nature, vol. 12(1), pages 1-9, 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.
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