Phonon nanocapacitor for storage and lasing of terahertz lattice waves

Abstract

We introduce a novel ultra-compact nanocapacitor of coherent phonons formed by high-finesse interference mirrors based on atomic-scale semiconductor metamaterials. Our molecular dynamics simulations show that the nanocapacitor stores THz monochromatic lattice waves, which can be used for phonon lasing - the emission of coherent phonons. Either one- or two-color phonon lasing can be realized depending on the geometry of the nanodevice. The two color regimes of the capacitor originates from the distinct transmittance dependance on the phonon wave packet incident angle for the two phonon polarizations at their respective resonances. Phonon nanocapacitor can be charged by cooling the sample equilibrated at room temperature or by the pump-probe technique. The nanocapacitor can be discharged by applying tunable reversible strain, resulting in the emission of coherent THz acoustic beams.

arXiv comment12 pages, 5 figures

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• A generalized decay law for particle- and wave-like thermal phonons
• Phononic real Chern insulator with protected corner modes in graphynes
• Manipulate Temperature Dependence of Thermal Conductivity of Graphene Phononic Crystal
• Sensing Coherent Phonons with Two-photon Interference
• A series circuit of thermal rectifiers: an effective way to enhance rectification ratio
• Determining Phonon Coherence Using Photon Sideband Detection