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Zeeman-Field-Induced Gapless-Gapped Transitions in the One-Dimensional Gross-Neveu Model

How an external Zeeman magnetic field reshapes the phase diagram of the doped one-dimensional Gross-Neveu model of massless fermions: the field imbalances the two spin populations, suppresses the gapless phase, drives a gapless-gapped transition at a critical field strength, shifts the tricritical point, and produces reentrant behavior, all obtained from the finite-temperature effective potential and a Ginzburg-Landau expansion.

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Tricritical behavior of a relativistic field theory in one dimension

Studies the finite-temperature phase structure of the one-dimensional (1+1) Gross-Neveu model, a quantum field theory of N flavors of massless fermions with a four-fermion interaction whose discrete …