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Large-gap insulating dimer ground state in monolayer IrTe2

Author

Listed:
  • Jinwoong Hwang

    (Lawrence Berkeley National Laboratory
    Pusan National University
    SLAC National Accelerator Laboratory)

  • Kyoo Kim

    (Korea Atomic Energy Research Institute)

  • Canxun Zhang

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

  • Tiancong Zhu

    (University of California
    Lawrence Berkeley National Laboratory)

  • Charlotte Herbig

    (University of California
    Lawrence Berkeley National Laboratory)

  • Sooran Kim

    (Kyungpook National University)

  • Bongjae Kim

    (Kunsan National University)

  • Yong Zhong

    (Lawrence Berkeley National Laboratory
    SLAC National Accelerator Laboratory
    Stanford University)

  • Mohamed Salah

    (Lawrence Berkeley National Laboratory
    Suez University)

  • Mohamed M. El-Desoky

    (Suez University)

  • Choongyu Hwang

    (Pusan National University)

  • Zhi-Xun Shen

    (SLAC National Accelerator Laboratory
    Stanford University)

  • Michael F. Crommie

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

  • Sung-Kwan Mo

    (Lawrence Berkeley National Laboratory)

Abstract

Monolayers of two-dimensional van der Waals materials exhibit novel electronic phases distinct from their bulk due to the symmetry breaking and reduced screening in the absence of the interlayer coupling. In this work, we combine angle-resolved photoemission spectroscopy and scanning tunneling microscopy/spectroscopy to demonstrate the emergence of a unique insulating 2 × 1 dimer ground state in monolayer 1T-IrTe2 that has a large band gap in contrast to the metallic bilayer-to-bulk forms of this material. First-principles calculations reveal that phonon and charge instabilities as well as local bond formation collectively enhance and stabilize a charge-ordered ground state. Our findings provide important insights into the subtle balance of interactions having similar energy scales that occurs in the absence of strong interlayer coupling, which offers new opportunities to engineer the properties of 2D monolayers.

Suggested Citation

  • Jinwoong Hwang & Kyoo Kim & Canxun Zhang & Tiancong Zhu & Charlotte Herbig & Sooran Kim & Bongjae Kim & Yong Zhong & Mohamed Salah & Mohamed M. El-Desoky & Choongyu Hwang & Zhi-Xun Shen & Michael F. C, 2022. "Large-gap insulating dimer ground state in monolayer IrTe2," Nature Communications, Nature, vol. 13(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-28542-y
    DOI: 10.1038/s41467-022-28542-y
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    References listed on IDEAS

    as
    1. Sungyu Park & So Young Kim & Hyoung Kug Kim & Min Jeong Kim & Taeho Kim & Hoon Kim & Gyu Seung Choi & C. J. Won & Sooran Kim & Kyoo Kim & Evgeny F. Talantsev & Kenji Watanabe & Takashi Taniguchi & San, 2021. "Superconductivity emerging from a stripe charge order in IrTe2 nanoflakes," Nature Communications, Nature, vol. 12(1), pages 1-8, December.
    2. Meng Wu & Zhenglu Li & Ting Cao & Steven G. Louie, 2019. "Physical origin of giant excitonic and magneto-optical responses in two-dimensional ferromagnetic insulators," Nature Communications, Nature, vol. 10(1), pages 1-8, December.
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