Spin transport in 2 D crystals and in elemental semiconductors with multivalley band structure

In the first part of the talk, I will present our recent findings for the spin transport in 2D membranes including monolayer transition-metal dichalogonides and graphene [1]. I will focus on spin flips induced by flexural phonons (Fig. 1), and show that the spin relaxation is ultrafast for electrons in freestanding membranes while being mitigated in supported membranes. This behavior is universal in 2D membranes that respect mirror symmetry and it leads to a counterintuitive inverse relation between mobility and spin relaxation.