Chandrasekharan, S; Li, A, *Quantum critical behavior in three dimensional lattice Gross-Neveu
models*, vol. 88
(April, 2013),
pp. 021701 [1304.7761v1], [doi] .
**Abstract:**

*We study quantum critical behavior in three dimensional lattice Gross-Neveu
models containing two massless Dirac fermions. We focus on two models with
SU(2) flavor symmetry and either a $Z_2$ or a U(1) chiral symmetry. Both models
could not be studied earlier due to sign problems. We use the fermion bag
approach which is free of sign problems and compute critical exponents at the
phase transitions. We estimate $\nu = 0.83(1)$, $\eta = 0.62(1)$, $\eta_\psi =
0.38(1)$ in the $Z_2$ and $\nu = 0.849(8)$, $\eta = 0.633(8)$, $\eta_\psi =
0.373(3)$ in the U(1) model.*