Tunable terahertz acoustic-phonon emission from monolayer molybdenum disulfide
Cheng-Xiang Zhao(赵承祥)1,†, Miao-Miao Zheng(郑苗苗)1, Yuan Qie(郄媛)1, and Fang-Wei Han(韩方微)2
1 College of Physics and Information Engineering, Shanxi Normal University, Taiyuan 030031, China; 2 School of Medical Information Engineering, Jining Medical University, Jining 272067, China
Abstract The acoustic-phonon emission from monolayer molybdenum disulfide (ML-MoS2) driven by a direct-current electric field is studied theoretically using the Boltzmann equation method. It is found that the Cerenkov emission of terahertz acoustic-phonons can be generated when a very weak electric field is applied to ML-MoS2. The physical mechanisms of acoustic-phonon emission are analyzed from the perspective of condensed matter physics. The acoustic-phonon emission from ML-MoS2 is also compared with those from graphene and GaAs. The results reveal that the frequencies of acoustic-phonons generated by ML-MoS2 are between the frequencies of those generated from GaAs and graphene. The results of this work suggest that the ML-MoS2 can make up for graphene and GaAs in respect of acoustic-phonon emission and be used in tunable hypersonic devices such as terahertz sound sources.
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11604192), the Fundamental Research Program of Shanxi Province, China (Grant No. 202103021224250), the Science and Technology Innovation Project of Colleges and Universities of Shanxi Province of China (Grant No. 2020L0242), and the Start-up funding from Shanxi Normal University (Grant No. 0505/02070351).
Cheng-Xiang Zhao(赵承祥), Miao-Miao Zheng(郑苗苗), Yuan Qie(郄媛), and Fang-Wei Han(韩方微) Tunable terahertz acoustic-phonon emission from monolayer molybdenum disulfide 2022 Chin. Phys. B 31 127202
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