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This document discusses excitonic effects in two-dimensional massless Dirac fermions with Coulomb interactions. The authors solve the Bethe-Salpeter equation within the ladder approximation. They find that the general 4-leg vertex function displays a power law behavior, with the exponent changing from real to complex above a critical coupling constant value. This suggests a quantum phase transition. The antisymmetric response shows similar critical behavior and poles for finite systems, also indicating a tr
- Author
- dr_blackadder
- Language
- EN