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Local gate control of Mott metal-insulator transition in a 2D metal-organic framework

Author

Listed:
  • Benjamin Lowe

    (Monash University
    Monash University)

  • Bernard Field

    (Monash University
    Monash University)

  • Jack Hellerstedt

    (Monash University
    Monash University)

  • Julian Ceddia

    (Monash University
    Monash University)

  • Henry L. Nourse

    (Okinawa Institute of Science and Technology Graduate University)

  • Ben J. Powell

    (The University of Queensland)

  • Nikhil V. Medhekar

    (Monash University
    Monash University)

  • Agustin Schiffrin

    (Monash University
    Monash University)

Abstract

Electron-electron interactions in materials lead to exotic many-body quantum phenomena, including Mott metal-insulator transitions (MITs), magnetism, quantum spin liquids, and superconductivity. These phases depend on electronic band occupation and can be controlled via the chemical potential. Flat bands in two-dimensional (2D) and layered materials with a kagome lattice enhance electronic correlations. Although theoretically predicted, correlated-electron Mott insulating phases in monolayer 2D metal-organic frameworks (MOFs) with a kagome structure have not yet been realised experimentally. Here, we synthesise a 2D kagome MOF on a 2D insulator. Scanning tunnelling microscopy (STM) and spectroscopy reveal a MOF electronic energy gap of ∼200 meV, consistent with dynamical mean-field theory predictions of a Mott insulator. Combining template-induced (via work function variations of the substrate) and STM probe-induced gating, we locally tune the electron population of the MOF kagome bands and induce Mott MITs. These findings enable technologies based on electrostatic control of many-body quantum phases in 2D MOFs.

Suggested Citation

  • Benjamin Lowe & Bernard Field & Jack Hellerstedt & Julian Ceddia & Henry L. Nourse & Ben J. Powell & Nikhil V. Medhekar & Agustin Schiffrin, 2024. "Local gate control of Mott metal-insulator transition in a 2D metal-organic framework," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-47766-8
    DOI: 10.1038/s41467-024-47766-8
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    References listed on IDEAS

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