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By employing the first-principles GW-Bethe-Salpeter Equation (BSE)simulation, we obtain, for the first time, the accurate quasiparticle (QP) bandgap, optical absorption spectra and their dependence on the gate field of gatedbilayer graphene (GBLG). Many-electron effects are shown to be extremelyimportant to understand these excited-state properties; enhancedelectron-electron interactions dramatically enlarge the QP band gap; infraredoptical absorption spectra are dictated by bright bound excitons. Our resultswell explain recent experiments and satisfyingly solve the puzzle about theinconsistency between experimentally measured transport and optical band gaps.Moreover, our calculation reveals fine excitonic structures and predicts exoticexcitonic effects that have not been observed yet, which can be of interest foroptoelectronics applications based on GBLG.

Enhanced Many-Electron Effects on Excited States of Gated Bilayer Graphene