The ratio of full LPBE thermal conductivity to RTA thermal conductivity indicates phonon hydrodynamics, with larger values signaling stronger collective phonon drift.
Ezzahri, Thermal decay in the one-dimensional tran- sient thermal grating experiment using modified Debye- Callaway model, Physical Review B106, 125203 (2022)
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Indicators for phonon hydrodynamics from first principles predictions of thermal conductivity
The ratio of full LPBE thermal conductivity to RTA thermal conductivity indicates phonon hydrodynamics, with larger values signaling stronger collective phonon drift.