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Moiré Phonons in Twisted Bilayer MoS2.
Lin, Miao-Ling; Tan, Qing-Hai; Wu, Jiang-Bin; Chen, Xiao-Shuang; Wang, Jin-Huan; Pan, Yu-Hao; Zhang, Xin; Cong, Xin; Zhang, Jun; Ji, Wei; Hu, Ping-An; Liu, Kai-Hui; Tan, Ping-Heng.
Afiliação
  • Lin ML; State Key Laboratory of Superlattices and Microstructures , Institute of Semiconductors, Chinese Academy of Sciences , Beijing 100083 , China.
  • Tan QH; CAS Center of Excellence in Topological Quantum Computation and College of Materials Science and Opto-Electronic Technology , University of Chinese Academy of Sciences , Beijing 100049 , China.
  • Wu JB; State Key Laboratory of Superlattices and Microstructures , Institute of Semiconductors, Chinese Academy of Sciences , Beijing 100083 , China.
  • Chen XS; CAS Center of Excellence in Topological Quantum Computation and College of Materials Science and Opto-Electronic Technology , University of Chinese Academy of Sciences , Beijing 100049 , China.
  • Wang JH; State Key Laboratory of Superlattices and Microstructures , Institute of Semiconductors, Chinese Academy of Sciences , Beijing 100083 , China.
  • Pan YH; School of Materials Science and Engineering, MOE Key Laboratory of Micro-Systems and Micro-Structures Manufacturing , Harbin Institute of Technology , Harbin 150080 , China.
  • Zhang X; State Key Laboratory of Mesoscopic Physics, School of Physics and Collaborative Innovation Center Quantum Matter , Peking University , Beijing 100871 , China.
  • Cong X; Department of Physics , Renmin University of China , Beijing 100872 , China.
  • Zhang J; State Key Laboratory of Superlattices and Microstructures , Institute of Semiconductors, Chinese Academy of Sciences , Beijing 100083 , China.
  • Ji W; State Key Laboratory of Superlattices and Microstructures , Institute of Semiconductors, Chinese Academy of Sciences , Beijing 100083 , China.
  • Hu PA; CAS Center of Excellence in Topological Quantum Computation and College of Materials Science and Opto-Electronic Technology , University of Chinese Academy of Sciences , Beijing 100049 , China.
  • Liu KH; State Key Laboratory of Superlattices and Microstructures , Institute of Semiconductors, Chinese Academy of Sciences , Beijing 100083 , China.
  • Tan PH; CAS Center of Excellence in Topological Quantum Computation and College of Materials Science and Opto-Electronic Technology , University of Chinese Academy of Sciences , Beijing 100049 , China.
ACS Nano ; 12(8): 8770-8780, 2018 Aug 28.
Article em En | MEDLINE | ID: mdl-30086224
ABSTRACT
The material choice, layer thickness, and twist angle widely enrich the family of van der Waals heterostructures (vdWHs), providing multiple degrees of freedom to engineer their optical and electronic properties. The moiré patterns in vdWHs create a periodic potential for electrons and excitons to yield many interesting phenomena, such as Hofstadter butterfly spectrum and moiré excitons. Here, in the as-grown/transferred twisted bilayer MoS2 (tBLMs), one of the simplest prototypes of vdWHs, we show that the periodic potentials of moiré patterns also modify the properties of phonons of its monolayer MoS2 constituent to generate Raman modes related to moiré phonons. These Raman modes correspond to zone-center phonons in tBLMs, which are folded from the off-center phonons in monolayer MoS2. However, the folded phonons related to crystallographic superlattices are not observed in the Raman spectra. By varying the twist angle, the moiré phonons of tBLM can be exploited to map the phonon dispersions of the monolayer constituent. The lattice dynamics of the moiré phonons are modulated by the patterned interlayer coupling resulting from periodic potential of moiré patterns, as confirmed by density functional theory calculations. The Raman intensity related to moiré phonons in all tBLMs are strongly enhanced when the excitation energy approaches the C exciton energy. This study can be extended to various vdWHs to deeply understand their Raman spectra, moiré phonons, lattice dynamics, excitonic effects, and interlayer coupling.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: ACS Nano Ano de publicação: 2018 Tipo de documento: Article País de afiliação: China

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: ACS Nano Ano de publicação: 2018 Tipo de documento: Article País de afiliação: China