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Microscopic theory of spin relaxation anisotropy in graphene with proximity-induced spin-orbit coupling
摘要： We present a microscopic theory of spin dynamics in weakly disordered graphene with uniform proximity-induced spin-orbit coupling (SOC). A time-dependent perturbative treatment is employed to derive the spin Bloch equations governing the spin dynamics at high electronic density for arbitrary ratio λSOC/η, where η is the disorder-induced quasiparticle broadening and λSOC is the largest spin-orbit energy scale. Rich scenarios are predicted, depending on a delicate competition between interface-induced Bychkov-Rashba and spin-valley interaction. In the motional narrowing regime of weak SOC (λSOC (cid:2) η), the anisotropy ratio of out-of-plane to in-plane spin lifetimes ζ = τ ⊥ s agrees qualitatively with a toy model of spins in a fluctuating SOC field proposed recently by Cummings and co-workers Phys. Rev. Lett. 119, 206601 (2017). For well-resolved SOC (λSOC (cid:2) η), the spin dynamics is characterized by fast damped oscillations with spins relaxing on the timescale of a single scattering event. In this regime, qualitatively different formulas for ζ are obtained, which can be useful to model spin transport in ultraclean van der Waals heterostructures.
关键词： spin-orbit coupling,van der Waals heterostructures,spin dynamics,Bychkov-Rashba,graphene,spin-valley interaction
更新于2025-09-04 15:30:14
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[Advances In Atomic, Molecular, and Optical Physics] Volume 67 || Radio-Frequency Spectroscopy as a Tool for Studying Coherent Spin Dynamics and for Application to Radio-Frequency Magnetometry
摘要： The technique of radio-frequency spectroscopy was introduced more than 50 years ago, but is continuing to evolve and is being used as an ever-more versatile tool. We describe the underlying processes that govern the various contributions to the spectroscopic signals, considering the atom-light couplings. We then apply this understanding to demonstrate how the coherent dynamics can be manipulated with different configurations of optical pumping. Finally, we discuss how to implement rf spectroscopy to give optimized sensitivity in atomic magnetometers.
关键词： radio-frequency spectroscopy,atom-light couplings,atomic magnetometry,optical pumping,coherent spin dynamics
更新于2025-09-04 15:30:14