The ratio of full LPBE thermal conductivity to RTA thermal conductivity indicates phonon hydrodynamics, with larger values signaling stronger collective phonon drift.
1 is solved forf λ using iterative solvers [20, 21], which have become computa- tionally inexpensive in recent years due to the improve- ments in computing hardware and algorithms
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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.