Exact Resonances Are Not Sufficient for Phonon Energy Diffusion

Wei Lin; Yong Zhang; Hong Zhao

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arXiv · 2608.03180

Exact Resonances Are Not Sufficient for Phonon Energy Diffusion

Wei Lin·Yong Zhang·Hong Zhao

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Abstract

Multi-phonon resonance conditions underpin kinetic theories of phonon transport and lattice thermalization. We show that exact resonance matching, nonzero interaction coefficients, and network connectivity do not guarantee persistent energy diffusion. Symmetry-enforced balance relations drive exact-resonant collision currents to nonthermal zero-flux states, producing kinetic arrest from individual resonant sets to connected networks. Complete energy spreading is sustained by quasi-resonances. The thermodynamic and weak-nonlinearity limits do not commute: the leading kinetic behavior is recovered in the former, whereas at fixed finite size the thermalization time diverges through higher-order crossovers as the nonlinearity vanishes. Exact-resonance existence and connectivity are therefore kinematic, not sufficient dynamical, criteria for phonon energy diffusion.

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Wei Lin, Yong Zhang, Hong Zhao. 2026-08-04. Exact Resonances Are Not Sufficient for Phonon Energy Diffusion. https://arxiv.org/abs/2608.03180

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