Vacuum induced transparency and slow light phenomena in a two-level atomic ensemble controlled by a cavity
Guo Yu-Jie†a),b), Nie Wen-Jiec)
       
The real and imaginary parts of the susceptibility as a function of δ for (a) g = 0 or (b) Ng 2 = 10 κγ with κ = 0.01 γ and Δ = 0.