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Advances in nanotechnology have facilitated the exploration of submicronthermal transport. At this scale, Fourier's law is no longer applicable, andthe governing equation for thermal transport is the phonon Boltzmann transportequation (BTE). However, the availability of open-source solvers for the phononBTE is limited, impeding progress in this field. This study introduces anopen-source package, GiftBTE, for numerically solving the non-gray phonon BTE.GiftBTE employs deterministic solutions and provides both steady-state andtransient solvers. For the steady-state solver, GiftBTE employs the implicitdiscrete ordinates method (DOM) with second-order spatial accuracy and thesynthetic iterative scheme. For the transient solver, GiftBTE employs theexplicit DOM with second-order spatial accuracy. This package demonstratesexcellent computational efficiency, enabling realistic three-dimensionalsimulations of devices and materials. By interfacing with first-principlescalculations, this solver enables parameter-free computation of submicronthermal transport. The application of GiftBTE includes, but is not limited to,computing the thermal conductivity of nanostructures, predicting temperaturerises in transistors, and simulating laser heating processes.

GiftBTE: An efficient deterministic solver for non-gray phonon Boltzmann transport equation