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Phonon renormalization in reconstructed MoS2 moiré superlattices.
Quan, Jiamin; Linhart, Lukas; Lin, Miao-Ling; Lee, Daehun; Zhu, Jihang; Wang, Chun-Yuan; Hsu, Wei-Ting; Choi, Junho; Embley, Jacob; Young, Carter; Taniguchi, Takashi; Watanabe, Kenji; Shih, Chih-Kang; Lai, Keji; MacDonald, Allan H; Tan, Ping-Heng; Libisch, Florian; Li, Xiaoqin.
Afiliação
  • Quan J; Department of Physics, The University of Texas at Austin, Austin, TX, USA.
  • Linhart L; Department of Physics, The University of Texas at Austin, Austin, TX, USA.
  • Lin ML; Institute for Theoretical Physics, Vienna University of Technology, Vienna, Austria.
  • Lee D; State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, China.
  • Zhu J; Department of Physics, The University of Texas at Austin, Austin, TX, USA.
  • Wang CY; Department of Physics, The University of Texas at Austin, Austin, TX, USA.
  • Hsu WT; Department of Physics, The University of Texas at Austin, Austin, TX, USA.
  • Choi J; Department of Physics, The University of Texas at Austin, Austin, TX, USA.
  • Embley J; Department of Physics, The University of Texas at Austin, Austin, TX, USA.
  • Young C; Department of Physics, The University of Texas at Austin, Austin, TX, USA.
  • Taniguchi T; Department of Physics, The University of Texas at Austin, Austin, TX, USA.
  • Watanabe K; National Institute for Material Science, Tsukuba, Japan.
  • Shih CK; National Institute for Material Science, Tsukuba, Japan.
  • Lai K; Department of Physics, The University of Texas at Austin, Austin, TX, USA.
  • MacDonald AH; Department of Physics, The University of Texas at Austin, Austin, TX, USA.
  • Tan PH; Department of Physics, The University of Texas at Austin, Austin, TX, USA.
  • Libisch F; State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, China. phtan@semi.ac.cn.
  • Li X; Institute for Theoretical Physics, Vienna University of Technology, Vienna, Austria. florian.libisch@tuwien.ac.at.
Nat Mater ; 20(8): 1100-1105, 2021 Aug.
Article em En | MEDLINE | ID: mdl-33753933
In moiré crystals formed by stacking van der Waals materials, surprisingly diverse correlated electronic phases and optical properties can be realized by a subtle change in the twist angle. Here, we discover that phonon spectra are also renormalized in MoS2 twisted bilayers, adding an insight to moiré physics. Over a range of small twist angles, the phonon spectra evolve rapidly owing to ultra-strong coupling between different phonon modes and atomic reconstructions of the moiré pattern. We develop a low-energy continuum model for phonons that overcomes the outstanding challenge of calculating the properties of large moiré supercells and successfully captures the essential experimental observations. Remarkably, simple optical spectroscopy experiments can provide information on strain and lattice distortions in moiré crystals with nanometre-size supercells. The model promotes a comprehensive and unified understanding of the structural, optical and electronic properties of moiré superlattices.

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Nat Mater Assunto da revista: CIENCIA / QUIMICA Ano de publicação: 2021 Tipo de documento: Article País de afiliação: Estados Unidos País de publicação: Reino Unido

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Nat Mater Assunto da revista: CIENCIA / QUIMICA Ano de publicação: 2021 Tipo de documento: Article País de afiliação: Estados Unidos País de publicação: Reino Unido