Non local spin voltage in DSM, WSM and Role of Impurities

In this talk, we look at nonlocal spin transport in 3D topological insulators, Dirac, and Weyl semimetals. We further investigate the role of scattering and impurities in the nonlocal spin transport signature of spin momentum locked materials. We combine different materials with different properties, such as spin momentum locking and diffusion length, to investigate the interfacial effects of heterostructures on nonlocal spin transports. Finally, we look at recent experimental results and explain their results based on our quantum transport modeling. Furthermore, The role of the emergent magnetic field generated from the Weyl nodes is investigated in nonlocally precessing the spins.