Quasiparticle energy and optical excitations of gated bilayer graphene
Quasiparticle energy and optical excitations of gated bilayer graphene
By employing the first-principles $GW$-Bethe-Salpeter equation simulation, we obtain the accurate quasiparticle (QP) band gap and optical absorption spectra of gated bilayer graphene. Enhanced electron-electron interactions dramatically enlarge the QP band gap; infrared optical absorption spectra are dictated by bright bound excitons. In particular, the energies of these excited states …