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Phonon renormalization in reconstructed MoS2 moiré superlattices

2021; Nature Portfolio; Volume: 20; Issue: 8 Linguagem: Inglês

10.1038/s41563-021-00960-1

1476-4660

Jiamin Quan, Lukas Linhart, Miao‐Ling Lin, Daehun Lee, Jihang Zhu, Chun‐Yuan Wang, Wei‐Ting Hsu, Junho Choi, Jacob Embley, Carter Young, Takashi Taniguchi, Kenji Watanabe, Chih‐Kang Shih, Keji Lai, A. H. MacDonald, Ping‐Heng Tan, Florian Libisch, Xiaoqin Li,

Nanowire Synthesis and Applications

In moir\'e crystals formed by stacking van der Waals (vdW) 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 MoS$_2$ twisted bilayers, adding a new perspective to moir\'e physics. Over a range of small twist angles, the phonon spectra evolve rapidly due to ultra-strong coupling between different phonon modes and atomic reconstructions of the moir\'e pattern. We develop a new low-energy continuum model for phonons that overcomes the outstanding challenge of calculating properties of large moir\'e supercells and successfully captures essential experimental observations. Remarkably, simple optical spectroscopy experiments can provide information on strain and lattice distortions in moir\'e crystals with nanometer-size supercells. The newly developed theory promotes a comprehensive and unified understanding of structural, optical, and electronic properties of moir\'e superlattices.