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Emergent layer stacking arrangements in c-axis confined MoTe2

Author

Listed:
  • James L. Hart

    (Cornell University)

  • Lopa Bhatt

    (Cornell University)

  • Yanbing Zhu

    (Stanford University)

  • Myung-Geun Han

    (Brookhaven National Laboratory)

  • Elisabeth Bianco

    (Cornell University)

  • Shunran Li

    (Yale University
    Yale University)

  • David J. Hynek

    (Yale University
    Yale University)

  • John A. Schneeloch

    (University of Virginia)

  • Yu Tao

    (University of Virginia)

  • Despina Louca

    (University of Virginia)

  • Peijun Guo

    (Yale University
    Yale University)

  • Yimei Zhu

    (Brookhaven National Laboratory)

  • Felipe Jornada

    (Stanford University)

  • Evan J. Reed

    (Stanford University)

  • Lena F. Kourkoutis

    (Cornell University
    Cornell University)

  • Judy J. Cha

    (Cornell University
    Cornell University)

Abstract

The layer stacking order in 2D materials strongly affects functional properties and holds promise for next-generation electronic devices. In bulk, octahedral MoTe2 possesses two stacking arrangements, the ferroelectric Weyl semimetal Td phase and the higher-order topological insulator 1T′ phase. However, in thin flakes of MoTe2, it is unclear if the layer stacking follows the Td, 1T′, or an alternative stacking sequence. Here, we use atomic-resolution scanning transmission electron microscopy to directly visualize the MoTe2 layer stacking. In thin flakes, we observe highly disordered stacking, with nanoscale 1T′ and Td domains, as well as alternative stacking arrangements not found in the bulk. We attribute these findings to intrinsic confinement effects on the MoTe2 stacking-dependent free energy. Our results are important for the understanding of exotic physics displayed in MoTe2 flakes. More broadly, this work suggests c-axis confinement as a method to influence layer stacking in other 2D materials.

Suggested Citation

  • James L. Hart & Lopa Bhatt & Yanbing Zhu & Myung-Geun Han & Elisabeth Bianco & Shunran Li & David J. Hynek & John A. Schneeloch & Yu Tao & Despina Louca & Peijun Guo & Yimei Zhu & Felipe Jornada & Eva, 2023. "Emergent layer stacking arrangements in c-axis confined MoTe2," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
  • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-40528-y
    DOI: 10.1038/s41467-023-40528-y
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    References listed on IDEAS

    as
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