Enhanced Kerr nonlinearity in a quantized four-level graphene nanostructure

Solookinejad Ghahraman, Panahi M, Ahmadi E, Hossein Asadpour Seyyed^†,

(a) Linear susceptibility χ⁽¹⁾ versus probe light detuning. Solid line corresponds to linear absorption and dashed line corresponds to dispersion. (b) Nonlinear susceptibility χ⁽³⁾ versus probe light detuning. Solid line corresponds to nonlinear absorption and dashed line corresponds to Kerr nonlinearity. The used parameters are Ω_p = 0.01γ, Ω_c = 0.4γ, Δ₂ = Δ₃ = 0, and θ = 0.