Optical bistability and multistability via double dark resonance in graphene nanostructure
Hossein Asadpour Seyyed†, , Solookinejad G, Panahi M, Ahmadi Sangachin E
       

Plots of output filed versus input field for different values of (a) electron concentration and (b) length of graphene sample. The selected parameters for (a) are Δp = Δ2 = Δ3 = 0 and and for (b) are Δp = 5γ2, Δ2 = Δ3 = 0, and The other selected parameters are as those in Fig. 2.