Moiré Potential, Lattice Relaxation, and Layer Polarization in Marginally Twisted MoS<sub>2</sub> Bilayers

DOI DOI Web Site 被引用文献1件 参考文献46件
  • Nikhil Tilak
    Department of Physics and Astronomy, Rutgers, The State University of New Jersey, 136 Frelinghuysen Rd, Piscataway, New Jersey 08854, United States
  • Guohong Li
    Department of Physics and Astronomy, Rutgers, The State University of New Jersey, 136 Frelinghuysen Rd, Piscataway, New Jersey 08854, United States
  • Takashi Taniguchi
    International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
  • Kenji Watanabe
    Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
  • Eva Y. Andrei
    Department of Physics and Astronomy, Rutgers, The State University of New Jersey, 136 Frelinghuysen Rd, Piscataway, New Jersey 08854, United States

書誌事項

公開日
2022-12-28
資源種別
journal article
権利情報
  • https://doi.org/10.15223/policy-029
  • https://doi.org/10.15223/policy-037
  • https://doi.org/10.15223/policy-045
DOI
  • 10.1021/acs.nanolett.2c03676
  • 10.48550/arxiv.2210.08368
公開者
American Chemical Society (ACS)

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説明

Artificially twisted heterostructures of semiconducting transition metal dichalcogenides (TMDs) offer unprecedented control over their electronic and optical properties via the spatial modulation of interlayer interactions and structural reconstruction. Here we study twisted MoS2 bilayers in a wide range of twist angles near 0° using Scanning Tunneling Microscopy/Spectroscopy. We investigate the twist angle-dependence of the moiré pattern which is dominated by lattice reconstruction for small angles (<2°) leading to large triangular domains with rhombohedral stacking. Local spectroscopy measurements reveal a large moiré-potential strength of 100-200 meV for angles <3°. In reconstructed regions we see a bias-dependent asymmetry between neighboring triangular domains which we relate to the vertical polarization which is intrinsic to rhombohedral stacked TMDs. This viewpoint is urther supported by spectroscopy maps and ambient Piezoresponse measurements. Our results provide a microscopic perspective on this new class of interfacial ferroelectrics and can offer clues for designing novel heterostructures which harness this effect.

34 pages and 10 figures

収録刊行物

  • Nano Letters

    Nano Letters 23 (1), 73-81, 2022-12-28

    American Chemical Society (ACS)

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