| Autor: |
Cheng-Xiang Zhao, Miao-Miao Zheng, Yuan Qie, Fang-Wei Han |
| Rok vydání: |
2022 |
| Předmět: |
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| Zdroj: |
Chinese Physics B. 31:127202 |
| ISSN: |
1674-1056 |
| Popis: |
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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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