Quantum critical behavior in three dimensional lattice Gross-Neveu models

Understand

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.