研究目的
Investigating the spin dynamics in graphene with uniform proximity-induced spin-orbit coupling (SOC) to understand the anisotropy ratio of out-of-plane to in-plane spin lifetimes and its implications for spin transport in van der Waals heterostructures.
研究成果
The study presents a microscopic theory of spin dynamics in graphene with proximity-induced SOC, predicting rich scenarios depending on the competition between Bychkov-Rashba and spin-valley interactions. It provides formulas for the spin relaxation time anisotropy ratio ζ in both weak and strong SOC regimes, which are useful for modeling spin transport in ultraclean van der Waals heterostructures. The findings highlight the importance of considering both intravalley and intervalley scattering processes in understanding spin relaxation in graphene.
研究不足
The formalism adopted is only valid in the highly doped regime of large Fermi energy, where the role of the SOC field is to induce Larmor precession. The picture might break down at low electronic density for graphene with large interface-induced SOC. The study does not account for skew scattering and modifications to the energy dependence of the collision integral for realistic (non-Gaussian) disorder.
