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A full gap above the Fermi level: the charge density wave of monolayer VS2

Author

Listed:
  • Camiel Efferen

    (Universität zu Köln)

  • Jan Berges

    (Universität Bremen)

  • Joshua Hall

    (Universität zu Köln)

  • Erik Loon

    (Universität Bremen)

  • Stefan Kraus

    (Universität zu Köln)

  • Arne Schobert

    (Universität Bremen)

  • Tobias Wekking

    (Universität zu Köln)

  • Felix Huttmann

    (Universität zu Köln)

  • Eline Plaar

    (Universität zu Köln)

  • Nico Rothenbach

    (Universität Duisburg-Essen)

  • Katharina Ollefs

    (Universität Duisburg-Essen)

  • Lucas Machado Arruda

    (Freie Universität Berlin)

  • Nick Brookes

    (European Synchrotron Research Facility (ESRF))

  • Gunnar Schönhoff

    (Universität Bremen)

  • Kurt Kummer

    (European Synchrotron Research Facility (ESRF))

  • Heiko Wende

    (Universität Duisburg-Essen)

  • Tim Wehling

    (Universität Bremen
    Universität Hamburg)

  • Thomas Michely

    (Universität zu Köln)

Abstract

In the standard model of charge density wave (CDW) transitions, the displacement along a single phonon mode lowers the total electronic energy by creating a gap at the Fermi level, making the CDW a metal–insulator transition. Here, using scanning tunneling microscopy and spectroscopy and ab initio calculations, we show that VS2 realizes a CDW which stands out of this standard model. There is a full CDW gap residing in the unoccupied states of monolayer VS2. At the Fermi level, the CDW induces a topological metal-metal (Lifshitz) transition. Non-linear coupling of transverse and longitudinal phonons is essential for the formation of the CDW and the full gap above the Fermi level. Additionally, x-ray magnetic circular dichroism reveals the absence of net magnetization in this phase, pointing to coexisting charge and spin density waves in the ground state.

Suggested Citation

  • 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.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-27094-x
    DOI: 10.1038/s41467-021-27094-x
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    References listed on IDEAS

    as
    1. R. Mankowsky & A. Subedi & M. Först & S. O. Mariager & M. Chollet & H. T. Lemke & J. S. Robinson & J. M. Glownia & M. P. Minitti & A. Frano & M. Fechner & N. A. Spaldin & T. Loew & B. Keimer & A. Geor, 2014. "Nonlinear lattice dynamics as a basis for enhanced superconductivity in YBa2Cu3O6.5," Nature, Nature, vol. 516(7529), pages 71-73, December.
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    Cited by:

    1. 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.

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