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- W2340811148 abstract "We investigate the dynamical breakdown of the chiral symmetry in the theory of Dirac fermions in graphene with long-range Coulomb interaction. We analyze the electron-hole vertex relevant for the dynamical gap generation in the ladder approximation, showing that it blows up at a critical value ${ensuremath{alpha}}_{c}$ in the graphene fine structure constant, which is quite sensitive to many-body corrections. Under static random phase approximation (RPA) screening of the interaction potential, we find that taking into account electron self-energy corrections to the vertex increases the critical coupling to ${ensuremath{alpha}}_{c}ensuremath{approx}4.9$, for a number $N=4$ of two-component Dirac fermions. When dynamical screening of the interaction is instead considered, the effect of Fermi velocity renormalization in the electron and hole states leads to the value ${ensuremath{alpha}}_{c}ensuremath{approx}1.75$ for $N=4$, substantially larger than that obtained without electron self-energy corrections ($ensuremath{approx}$0.99), but still below the nominal value of the interaction coupling in isolated free-standing graphene." @default.
- W2340811148 created "2016-06-24" @default.
- W2340811148 creator A5048201324 @default.
- W2340811148 date "2012-02-13" @default.
- W2340811148 modified "2023-10-14" @default.
- W2340811148 title "Electron self-energy effects on chiral symmetry breaking in graphene" @default.
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- W2340811148 doi "https://doi.org/10.1103/physrevb.85.085420" @default.
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