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Download Hi-Res ImageDownload to MS-PowerPointCite This:Nano Lett. 2023, 23, 24, 11510-11516
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    Quantifying Strain in Moiré Superlattice
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    • Jiamin Quan
      Jiamin Quan
      Department of Physics, The University of Texas at Austin, Austin, Texas 78712, United States
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    • Ganbin Chen
      Ganbin Chen
      Department of Aerospace Engineering and Engineering Mechanics, The University of Texas at Austin, Austin, Texas 78712, United States
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    • Lukas Linhart
      Lukas Linhart
      Institute for Theoretical Physics, Vienna University of Technology, Wiedner Hauptstrasse 8-10, 1040 Vienna, Austria
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    • Zhida Liu
      Zhida Liu
      Department of Physics, The University of Texas at Austin, Austin, Texas 78712, United States
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    • Takashi Taniguchi
      Takashi Taniguchi
      Research Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
      More by Takashi Taniguchi
      Orcidhttps://orcid.org/0000-0002-1467-3105
    • Kenji Watanabe
      Kenji Watanabe
      Research Center for Electronic and Optical Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
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      Orcidhttps://orcid.org/0000-0003-3701-8119
    • Florian Libisch
      Florian Libisch
      Institute for Theoretical Physics, Vienna University of Technology, Wiedner Hauptstrasse 8-10, 1040 Vienna, Austria
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      Orcidhttps://orcid.org/0000-0001-5641-9458
    • Rui Huang*
      Rui Huang
      Department of Aerospace Engineering and Engineering Mechanics, The University of Texas at Austin, Austin, Texas 78712, United States
      *Email for R.H.: [email protected]
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    • Xiaoqin Li*
      Xiaoqin Li
      Department of Physics, The University of Texas at Austin, Austin, Texas 78712, United States
      *Email for X.L.: [email protected]
      More by Xiaoqin Li
      Orcidhttps://orcid.org/0000-0002-2279-3078
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    Nano Letters

    Cite this: Nano Lett. 2023, 23, 24, 11510–11516
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    https://doi.org/10.1021/acs.nanolett.3c03115
    Published December 12, 2023
    Copyright © 2023 American Chemical Society
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    Abstract

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    In twisted van der Waals (vdW) bilayers, intrinsic strain associated with the moiré superlattice and unintentionally introduced uniaxial strain may be present simultaneously. Both strains are able to lift the degeneracy of the E2g phonon modes in Raman spectra. Because of the different rotation symmetry of the two types of strain, the corresponding Raman intensity exhibits a distinct polarization dependence. We compare a 2.5° twisted MoS2 bilayer, in which the maximal intrinsic moiré strain is anticipated, and a natural MoS2 bilayer with an intentionally introduced uniaxial strain. By analyzing the frequency shift of the E2g doublet and their polarization dependence, we can not only determine the direction of unintentional uniaxial strain in the twisted bilayer but also quantify both strain components. This simple strain characterization method based on far-field Raman spectra will facilitate the studies of electronic properties of moiré superlattices under the influence of combined intrinsic and external strains.

    Copyright © 2023 American Chemical Society

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    Supporting Information

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.nanolett.3c03115.

    • Sample preparation, Raman measurement, continuum model and calculation, the measured Raman spectra as a function of twist angle, the Raman spectrum from another sample of 2.5°, and low-frequency Raman mapping (PDF)

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    Cited By

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    This article is cited by 1 publications.

    1. Krishna Prasad Bera, Darshit Solanki, Shinjan Mandal, Rabindra Biswas, Takashi Taniguchi, Kenji Watanabe, Varun Raghunathan, Manish Jain, A. K. Sood, Anindya Das. Twist Angle-Dependent Phonon Hybridization in WSe2/WSe2 Homobilayer. ACS Nano 2024, 18 (35) , 24379-24390. https://doi.org/10.1021/acsnano.4c06767
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    Nano Letters

    Cite this: Nano Lett. 2023, 23, 24, 11510–11516
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.nanolett.3c03115
    Published December 12, 2023
    Copyright © 2023 American Chemical Society
    Request reuse permissions

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