Optical conductance and polarization of the monolayer graphene in the presence of Rashba spin orbit interaction and electromagnetic wave

Abstract

We present a theoretical investigation of the optical conductivity of graphene layer in the presence of Rashba spin-orbit coupling (SOC). By employing the massless Dirac description, we evaluate the combined impacts of the Rashba strength and chemical potential on the inter and intra conductivity within the sample. Our numerical findings revealed that the conductivity and polarization are highly sensitive to these pivotal highlighted parameters. Real and imaginary parts of both spin-dependent optical conductivity ${\sigma }^{intra}$ and ${\sigma }^{inter}$ behave differently with respect to the relevant managing factors and could be fine-tuned to advance spintronics. The imaginary parts exhibited strong sensitivity to changes in both λ and μ. Moreover, the dynamic response of the inspected system, particularly in terms of energy absorption and dissipation, is heavily influenced by the modulation of (λ, μ) pair. More importantly, the computational outcomes evidenced that the optical characteristics of this system differ significantly from those of a graphene layer due to the Rashba coupling incorporation. Spin-dependent optical conductivity can unlock new functionalities and enhance the performance of graphene in both spin-based electronics and light-based technologies, offering promising pathways for next-generation devices.