Generation and amplification of confined acoustic phonons in a quantum wire via the Čerenkov effect

Huang, Zhifeng; Shi, Yi; Xin, Yuchen; Peng, Lin; Zhang, R.; Zheng, Youdou

doi:10.1016/j.physleta.2005.05.036

Cited by 6 publications

(3 citation statements)

References 21 publications

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“…Net acoustic-phonon emission can be obtained if the electron velocity exceeds the acoustic-phonon velocity, which is known as the Cerenkov acoustic-phonon emission. A variety of works have indicated that terahertz (THz) acoustic-phonons can be obtained via Cerenkov emission from, for example, GaAs, [12] three-dimensional Dirac system, [13] graphene, [14] quantum wire (well), [15,16] and heterojunction structure. [17] In addition to the above materials, it is still significant to find outstanding materials that can gener-ate high-frequency acoustic-phonons.…”

Section: Introductionmentioning

confidence: 99%

Tunable terahertz acoustic-phonon emission from monolayer molybdenum disulfide

Zhao¹,

Zheng²,

Yuan-Qie³

et al. 2022

Chinese Phys. B

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The acoustic-phonon emission from monolayer molybdenum disulfide (ML-MoS2) driven by a direct-current electric field is studied theoretically by using the Boltzmann equation method. It is found that 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 from ML-MoS2 are between the frequencies of those generated from GaAs and graphene. The results of this work suggest that 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.

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Section: Introductionmentioning

confidence: 99%

Tunable terahertz acoustic-phonon emission from monolayer molybdenum disulfide

Zhao¹,

Zheng²,

Yuan-Qie³

et al. 2022

Chinese Phys. B

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“…Heat-carrying phonons are high-frequency lattice vibrations in materials ranging from few hundreds gigahertz to tens of terahertz. While there have been experiments demonstrating phonon amplification [6][7][8][9] and phonon generation at low temperatures [10], it is only recently that the role of phonon coherence in heat transport has been discussed.…”

Section: Introductionmentioning

confidence: 99%

Phonon coherence and its effect on thermal conductivity of nanostructures

Xie

Ding

Zhang

2018

Advances in Physics: X

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The concept of coherence is one of the fundamental phenomena in electronics and optics. In addition to electron and photon, phonon is another important energy and information carrier in nature. Without any doubt, exploration of the phonon coherence and its impact on thermal conduction will markedly change many aspects in broad applications for heat control and management in the real world. So far, the application of coherent effect on manipulation of phonon transport is a challenging work. In this article, we review recent advances in the study of the phonon coherent transport in nanomaterials and nanostructures. We first briefly look back the classical and quantum theory of coherence. Next, we review the progresses made in the understanding of phonon coherence in superlattice, nanowires and nanomeshes, respectively, and focus on the effect of phonon coherence on thermal conductivity. Finally, we introduce the recent advances in the direct detection of phonon coherence using optical coherence theory. ARTICLE HISTORY

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“…Moreover, comparing to unfilled polymers, fiber-reinforced polymer matrix composites provide an essential improvement of different mechanical properties [1]. Considering tribological properties, the studies reported in [2] showed that the application field of polymer matrix composites with micron-sized functional fillers could be extended by additionally incorporating a small fraction of inorganic nanoparticles.…”

Section: Introductionmentioning

confidence: 99%