We present results from numerical simulations of the (2 + 1)-dimensional Gross-Neveu model with a U (1) chiral symmetry and N f = 4 fermion species at nonzero temperature. We provide evidence that there are two different chirally symmetric phases, one critical and one with finite correlation length, separated by a Berezinskii-Kosterlitz-Thouless transition. We have also identified a regime above the critical temperature in which the fermions acquire a screening mass even in the absence of chiral symmetry breaking, analogous to the pseudogap behaviour observed in cuprate superconductors. © 2001 Elsevier Science B.V.
Hands, S. J., Kogut, J. B., & Strouthos, C. G. (2001). The (2 + 1)-dimensional Gross-Neveu model with a U (1) chiral symmetry at nonzero temperature. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 515(3–4), 407–413. https://doi.org/10.1016/S0370-2693(01)00885-1