Abstract
We show that, at sufficiently large strength of the long-range Coulomb interaction, a mass term breaking parity (so-called Haldane mass) is dynamically generated in the many-body theory of Dirac fermions describing the graphene layer. While the tendency towards chiral symmetry breaking is stronger than for the dynamical breakdown of parity at spatial dimension D > 2, we find that the situation is reversed at D = 2. The need to regularize the many-body theory in a gauge-invariant manner (taking the limit D = 2 − ϵ) is what leads to the dominance of the parity-breaking pattern in graphene. We compute the critical coupling for the generation of a parity-breaking mass from the finite radius of convergence of the ladder series supplemented with electron self-energy corrections, finding a value quite close to the effective interaction strength for graphene in vacuum after including Fermi velocity renormalization and static random-phase approximation (RPA) screening of the Coulomb interaction.
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ArXiv ePrint: 1211.3905
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González, J. Dynamical breakdown of parity and time-reversal invariance in the many-body theory of graphene. J. High Energ. Phys. 2013, 175 (2013). https://doi.org/10.1007/JHEP07(2013)175
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DOI: https://doi.org/10.1007/JHEP07(2013)175