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We present evidence of a drastic renormalization of the optical conductivityof graphene on SrTiO$_3$ resulting in almost full transparency in theultraviolet region. These findings are attributed to resonant excitonic effectsfurther supported by \emph{ab initio} Bethe-Salpeter equation and densityfunctional theory calculations. The ($\pi$,$\pi$*)-orbitals of graphene andTi-3\textit{d} $t_{2g}$ orbitals of SrTiO$_3$ are strongly hybridized and theinteractions of electron-hole states residing in those orbitals play dominantrole in the graphene optical conductivity. These interactions are present muchbelow the optical band gap of bulk SrTiO$_3$. These results open a possibilityof manipulating interaction strengths in graphene via \textit {d}-orbitalswhich could be crucial for optical applications.

Optical conductivity renormalization of graphene on SrTiO$_{3}$ due to resonant excitonic effects mediated by Ti 3\textit{d} orbitals