The Fock exchange contribution to self-screening shrinks the band gap of biased bilayer graphene by about a factor of two and produces a sharp n^{1/5} drop in the gap at low doping.
To explain this step-like reduction in Fig
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Screening of the band gap in electrically biased bilayer graphene: From Hartree to Hartree-Fock
The Fock exchange contribution to self-screening shrinks the band gap of biased bilayer graphene by about a factor of two and produces a sharp n^{1/5} drop in the gap at low doping.