Terahertz Spin Resonance of Proximitized Dirac Electrons

We investigate spin-light coupling phenomena in van der Waals heterostructures consisting of two-dimensional (2D) Dirac crystals proximitized by a magnetic layer. A strong magnetic proximity effect results in the modification of the 2D electron spectrum with the appearance of different spin-splitting terms and electron’s equilibrium spin polarization [1,2]. Motivated by these factors we have explored the resonant spin generation of proximitized Dirac electrons by THz ac-electric field and have revealed the existence of a new scenario for the electric dipole spin resonance (EDSR). We focus on the resonant spin dynamics of electrons in a single layer of magnetically proximitized graphene, and discuss emerging EDSR features absent in systems with a parabolic spectrum [3]. Our results demonstrate the enhancement of EDSR in a graphene and reveal an anomalous polarization structure of the absorption coefficient. The developed theory allowed us to propose a THz detector, in which the photogenerated nonequilibrium spin polarization in graphene can be read due to spin-charge tunneling conversion at the ferromagnet/graphene interface.