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Proximity induced charge density wave in a graphene/1T-TaS2 heterostructure

Author

Listed:
  • Nikhil Tilak

    (the State University of New Jersey)

  • Michael Altvater

    (the State University of New Jersey)

  • Sheng-Hsiung Hung

    (National Tsing Hua University)

  • Choong-Jae Won

    (Pohang University of Science and Technology)

  • Guohong Li

    (the State University of New Jersey)

  • Taha Kaleem

    (the State University of New Jersey)

  • Sang-Wook Cheong

    (the State University of New Jersey)

  • Chung-Hou Chung

    (National Yang Ming Chiao Tung University
    National Center for Theoretical Sciences
    National Yang Ming Chiao Tung University)

  • Horng-Tay Jeng

    (National Tsing Hua University
    National Center for Theoretical Sciences
    Academia Sinica)

  • Eva Y. Andrei

    (the State University of New Jersey)

Abstract

The proximity-effect, whereby materials in contact appropriate each other’s electronic-properties, is widely used to induce correlated states, such as superconductivity or magnetism, at heterostructure interfaces. Thus far however, demonstrating the existence of proximity-induced charge-density-waves (PI-CDW) proved challenging. This is due to competing effects, such as screening or co-tunneling into the parent material, that obscured its presence. Here we report the observation of a PI-CDW in a graphene layer contacted by a 1T-TaS2 substrate. Using scanning tunneling microscopy (STM) and spectroscopy (STS) together with theoretical-modeling, we show that the coexistence of a CDW with a Mott–gap in 1T-TaS2 coupled with the Dirac-dispersion of electrons in graphene, makes it possible to unambiguously demonstrate the PI-CDW by ruling out alternative interpretations. Furthermore, we find that the PI-CDW is accompanied by a reduction of the Mott gap in 1T-TaS2 and show that the mechanism underlying the PI-CDW is well-described by short-range exchange-interactions that are distinctly different from previously observed proximity effects.

Suggested Citation

  • Nikhil Tilak & Michael Altvater & Sheng-Hsiung Hung & Choong-Jae Won & Guohong Li & Taha Kaleem & Sang-Wook Cheong & Chung-Hou Chung & Horng-Tay Jeng & Eva Y. Andrei, 2024. "Proximity induced charge density wave in a graphene/1T-TaS2 heterostructure," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-51608-y
    DOI: 10.1038/s41467-024-51608-y
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    References listed on IDEAS

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