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Article Dans Une Revue Physical Review B Année : 2021

Generalized decay law for particlelike and wavelike thermal phonons

Zhongwei Zhang
Yangyu Guo
Jie Chen
Masahiro Nomura

Résumé

Our direct atomic simulations reveal that a thermally activated phonon mode involves a large population of elastic wavepackets. These excitations are characterized by a wide distribution of lifetimes and coherence times expressing particle-and wave-like natures. In agreement with direct simulations, our theoretical derivation yields a generalized law for the decay of the phonon number taking into account coherent effects. Before the conventional exponential decay due to phononphonon scattering, this law introduces a delay proportional to the square of the coherence time. This additional regime leads to a moderate increase in the relaxation times and thermal conductivity. This work opens new horizons in the understanding of the origin and the treatment of thermal phonons.
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hal-03406385 , version 1 (27-10-2021)

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Zhongwei Zhang, Yangyu Guo, Marc Bescond, Jie Chen, Masahiro Nomura, et al.. Generalized decay law for particlelike and wavelike thermal phonons. Physical Review B, 2021, 103 (18), ⟨10.1103/PhysRevB.103.184307⟩. ⟨hal-03406385⟩
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