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Rotational and dilational reconstruction in transition metal dichalcogenide moiré bilayers

Author

Listed:
  • Madeline Winkle

    (University of California)

  • Isaac M. Craig

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

  • Stephen Carr

    (Brown University
    Brown University)

  • Medha Dandu

    (Lawrence Berkeley National Laboratory)

  • Karen C. Bustillo

    (Lawrence Berkeley National Laboratory)

  • Jim Ciston

    (Lawrence Berkeley National Laboratory)

  • Colin Ophus

    (Lawrence Berkeley National Laboratory)

  • Takashi Taniguchi

    (National Institute for Materials Science)

  • Kenji Watanabe

    (National Institute for Materials Science)

  • Archana Raja

    (Lawrence Berkeley National Laboratory)

  • Sinéad M. Griffin

    (Lawrence Berkeley National Laboratory
    Lawrence Berkeley National Laboratory)

  • D. Kwabena Bediako

    (University of California
    Lawrence Berkeley National Laboratory)

Abstract

Lattice reconstruction and corresponding strain accumulation plays a key role in defining the electronic structure of two-dimensional moiré superlattices, including those of transition metal dichalcogenides (TMDs). Imaging of TMD moirés has so far provided a qualitative understanding of this relaxation process in terms of interlayer stacking energy, while models of the underlying deformation mechanisms have relied on simulations. Here, we use interferometric four-dimensional scanning transmission electron microscopy to quantitatively map the mechanical deformations through which reconstruction occurs in small-angle twisted bilayer MoS2 and WSe2/MoS2 heterobilayers. We provide direct evidence that local rotations govern relaxation for twisted homobilayers, while local dilations are prominent in heterobilayers possessing a sufficiently large lattice mismatch. Encapsulation of the moiré layers in hBN further localizes and enhances these in-plane reconstruction pathways by suppressing out-of-plane corrugation. We also find that extrinsic uniaxial heterostrain, which introduces a lattice constant difference in twisted homobilayers, leads to accumulation and redistribution of reconstruction strain, demonstrating another route to modify the moiré potential.

Suggested Citation

  • Madeline Winkle & Isaac M. Craig & Stephen Carr & Medha Dandu & Karen C. Bustillo & Jim Ciston & Colin Ophus & Takashi Taniguchi & Kenji Watanabe & Archana Raja & Sinéad M. Griffin & D. Kwabena Bediak, 2023. "Rotational and dilational reconstruction in transition metal dichalcogenide moiré bilayers," Nature Communications, Nature, vol. 14(1), pages 1-11, December.
  • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-38504-7
    DOI: 10.1038/s41467-023-38504-7
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    2. James L. Hart & Saif Siddique & Noah Schnitzer & Stephen D. Funni & Lena F. Kourkoutis & Judy J. Cha, 2023. "In operando cryo-STEM of pulse-induced charge density wave switching in TaS2," Nature Communications, Nature, vol. 14(1), pages 1-7, December.

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