Tunable terahertz acoustic-phonon emission from monolayer molybdenum disulfide

doi:10.1088/1674-1056/ac7f8d

中国物理B ›› 2022, Vol. 31 ›› Issue (12): 127202-127202.doi: 10.1088/1674-1056/ac7f8d

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

收稿日期:2022-01-03 修回日期:2022-06-20 接受日期:2022-07-08 出版日期:2022-11-11 发布日期:2022-11-11
通讯作者: Cheng-Xiang Zhao E-mail:cxzhaosxnu@163.com
基金资助:
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).

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

Received:2022-01-03 Revised:2022-06-20 Accepted:2022-07-08 Online:2022-11-11 Published:2022-11-11
Contact: Cheng-Xiang Zhao E-mail:cxzhaosxnu@163.com
Supported by:
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).

摘要/Abstract

摘要： 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.

关键词: acoustic-phonon emission, terahertz, monolayer molybdenum disulfide

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.

Key words: acoustic-phonon emission, terahertz, monolayer molybdenum disulfide

中图分类号: (Acoustoelectric effects)

72.50.+b

68.60.Bs (Mechanical and acoustical properties) 63.20.kd (Phonon-electron interactions)

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[J]. 中国物理B, 2022, 31(12): 127202-127202.

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[J]. Chin. Phys. B, 2022, 31(12): 127202-127202.

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Tunable terahertz acoustic-phonon emission from monolayer molybdenum disulfide

Tunable terahertz acoustic-phonon emission from monolayer molybdenum disulfide

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