Non-Fourier heat transport in graphene nanoribbons: Regulation of temperature oscillations and cooling effects.

This article focuses on investigating transient phonon heat transport in graphene nanoribbons under Gaussian thermal pulse excitation using a non-Fourier heat conduction model based on the dual-phase lag (DPL) theory. Employing an ab initio finite element method (FEM) simulation framework, the study reveals that at low temperatures (e.g., 80 K), normal (N) phonon scattering dominates, leading to temperature oscillations and hydrodynamic heat transport characterized by thermal waves and localized cooling effects. As the initial temperature rises (150–300 K), resistive (R) scattering becomes predominant, causing a transition toward diffusive heat transport and the disappearance of oscillatory behavior. The research provides theoretical insights into phonon hydrodynamics in low-dimensional materials and offers a foundation for optimizing thermal management in graphene-based semiconductor devices and transient thermal grating experiments.