Dominant two-dimensional electron-phonon interactions in the Dirac semimetal Na₃Bi

Topological Dirac semimetals such as Na₃Bi exhibit unconventional transport properties due to their Dirac-like gapless excitations near the Fermi level. A microscopic understanding of charge carrier scattering and transport in these materials remains an outstanding challenge. In this talk, we will present first-principles calculations of electron-phonon (e-ph) interactions and phonon-limited transport in the Dirac semimetal Na₃Bi. Our findings reveal that e-ph interactions in Na₃Bi are dominated by two-dimensional (2D) shear phonons with momentum in the x-y plane. We explain the origin of these 2D e-ph interactions and analyze their key role in charge transport via mobility and resistivity calculations in the framework of the ab initio Boltzmann transport equation (BTE). To conclude, we will discuss an extension of the ab initio BTE to study (magneto)transport in both Weyl and Dirac semimetals, by including the Berry curvature computed from first principles.