  We study the Renormalization Group (RG) flow of AC conductivity in soft wall
model of holographic QCD. We consider the charged black hole metric and the
explicit form of AC conductivity is obtained at the cut-off surface. We plot
the numerical solution of conductivity flow as a function of radial
co-ordinate. The equation of gauge field is also considered and the numerical
solution is obtained for AC conductivity as a function of frequency. The
results for AC conductivity are also obtained for different values of chemical
potential and Gauss-Bonnet couplings.
