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We present evidence of a drastic renormalization of the optical conductivity of graphene on SrTiO resulting in almost full transparency in the ultraviolet region. These findings are attributed to resonant excitonic effects further supported by\emph {ab initio} Bethe-Salpeter equation and density functional theory calculations. The (, *)-orbitals of graphene and Ti-3\textit {d} orbitals of SrTiO are strongly hybridized and the interactions of electron-hole states residing in those orbitals play dominant role in the graphene optical conductivity. These interactions are present much below the optical band gap of bulk SrTiO . These results open a possibility of manipulating interaction strengths in graphene via\textit {d}-orbitals which could be crucial for optical applications.
Publication date: 
3 Dec 2014

Pranjal Kumar Gogoi, Paolo E Trevisanutto, Ming Yang, Iman Santoso, Teguh Citra Asmara, Aleksandrs Terentjevs, Fabio Della Sala, Mark BH Breese, T Venkatesan, Yuan Ping Feng, Kian Ping Loh, Antonio H Castro Neto, Andrivo Rusydi

Biblio References: 
arXiv preprint arXiv:1412.1264