Quantum Phase Diagram of the $2+1$D Untruncated SU$(2)$ Lattice Gauge Theory with Dynamical Fermions

• URL: http://arxiv.org/abs/2607.26132v1
• Date: Tue, 28 Jul 2026 18:00:01 GMT
• Title: Quantum Phase Diagram of the $2+1$D Untruncated SU$(2)$ Lattice Gauge Theory with Dynamical Fermions
• Abstract summary: We study the ground-state behavior of the SU$(2)$ lattice gauge theory with staggered fermions on an $Ltimes L$ square lattice.<n>We find a magnetic-flux transition at $ast=-0.040pm 0.005$, with no resolvable drift of the transition point as the electric coupling is varied.<n>The chiral condensate, a gauge-invariant Wilson-line mesonor, and the local color density consistently reveal the emergence of coherent gauge-assisted matter dynamics.
• Score: 0.0028001975341488856
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Non-Abelian gauge theories with dynamical matter govern the strong interaction and a broad class of strongly correlated quantum systems, yet their ground-state properties remain difficult to obtain from first principles. Using a continuous-group variational Monte Carlo approach that retains the full SU$(2)$ gauge field without truncation, we determine the ground-state behavior of the SU$(2)$ lattice gauge theory with staggered fermions on an $L\times L$ square lattice. Treating the magnetic and electric couplings $λ$ and $g^2$ independently, we find a magnetic-flux transition at $λ^\ast=-0.040\pm 0.005$, with no resolvable drift of the transition point as the electric coupling is varied. Along the physical coupling line $λ=4/g^2$, for $L=4,6,8$, we uncover a gauge-matter delocalization crossover from a flux-disordered regime at strong electric coupling to an ordered unity-flux regime at weak coupling. The chiral condensate, a gauge-invariant Wilson-line meson correlator, and the local color density consistently reveal the emergence of coherent gauge-assisted matter dynamics. Together, these results provide a unified physical picture of how magnetic-flux ordering and fermionic coherence develop in an untruncated non-Abelian lattice gauge theory.

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