Chiral critical behavior of 3D lattice fermionic models with quartic interactions

Abstract

We study the critical behavior of the three-dimensional (3D) Gross-Neveu (GN) model with $N_f$ Dirac fermionic flavors and quartic interactions, at the chiral ${\mathbb{Z}}_2$ transition in the massless ${\mathbb{Z}}_2$-symmetric limit. For this purpose, we consider a lattice GN model with staggered Kogut-Susskind fermions and a scalar field coupled to the scalar bilinear fermionic operator, which effectively realizes the attractive four-fermion interaction. We perform Monte Carlo (MC) simulations for $N_f=4,8,12,16$. By means of finite-size scaling analyses of the numerical data, we obtain estimates of the critical exponents that are compared with the large-$N_f$ predictions obtained using the continuum GN field theory. We observe a substantial agreement. This confirms that lattice GN models with staggered fermions provide a nonpertubative realization of the GN quantum field theory, even though the lattice interactions explicitly break the flavor $\mathrm{U}(N_f)\otimes \mathrm{U}(N_f)$ symmetry of the GN field theory, which is only recovered in the critical limit.

11 pages

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Cited by in corpus (4)

• Absence of inhomogeneous chiral phases in 2+1-dimensional four-fermion and Yukawa models
• Emus live on the Gross-Neveu-Yukawa archipelago
• Angle-Tuned Gross-Neveu Quantum Criticality in Twisted Bilayer Graphene: A Quantum Monte Carlo Study
• Conjecture on the lower bound of the length-scale critical exponent $\nu$ at continuous phase transitions