Nonequilibrium phonon dynamics beyond the quasiequilibrium approach
arXiv:1707.03077 · doi:10.1103/PhysRevB.96.024301
Abstract
The description of nonequilibrium states of solids in a simplified manner is a challenge in the field of ultrafast dynamics. Here, the phonon thermalization in solids through the three-phonon scatterings is investigated by solving the Boltzmann transport equation (BTE). The numerical solution of the BTE shows that the transverse acoustic and longitudinal acoustic (LA) phonon temperatures are not well-defined during the relaxation, indicating the breakdown of the quasiequilibrium approximation. The development of hot and cold phonons and the backward energy flow from low to high energy phonons are observed in the initial and final stage of the relaxation, respectively. A minimal model is presented to relate the latter with the power-law decay of the LA phonon energy.
arXiv comment10 pages, 12 figures
References in corpus (12)
- Phonon anharmonicities in graphite and graphene
- Quasiparticle relaxation dynamics in superconductors with different gap structures: theory and experiments on YBa_{2}Cu_{3}O_{7-δ}
- Electronic Cooling in Graphene
- Electron-phonon heat transfer in monolayer and bilayer graphene
- Electron-phonon coupling and energy flow in a simple metal beyond the two-temperature approximation
- Ab initio phonon coupling and optical response of hot electrons in plasmonic metals
- Electron relaxation in metals: Theory and exact analytical solutions
- Non-thermal hot electrons ultrafastly generating hot optical phonons in graphite
- Imaging nonequilibrium atomic vibrations with x-ray diffuse scattering
- Theory of the electron relaxation in metals excited by an ultrashort optical pump
- Electronic Cooling in Weyl and Dirac Semimetals
- Revealing the ultrafast light-to-matter energy conversion before heat diffusion in a layered Dirac semimetal
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- Energy relaxation and electron-phonon coupling in laser-excited metals
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- Modeling the relaxation processes of photoexcited solids: A short review