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arXiv · 2609.16132

Exact group invariant scar towers in two dimensional gauge theories

João Barata·Kiryl Pakrouski·Andrey V. Sadofyev
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Abstract

We construct exact many-body scar towers in two dimensional gauge theories with two flavors of massless fundamental fermions. For oppositely charged fermions, the scar subspace is generated by a gauge-neutral $η$-pairing operator, and admits a purely algebraic construction. Exact diagonalization methods reveal anomalously low entanglement and long-range pair correlations in the scar states. Charge conjugation maps the $η$-tower to a vector-flavor polarization sector of the equal charge model, yielding an interpretation as a coherent flavor mode with Josephson-like phase dynamics. Finite fermion masses mix the protected pair with an orthogonal channel and destroy the exact tower. The identified scar tower can be algebraically realized in a large family of lattice field theories, revealing a universal character of these states. Our results provide an analytical construction of invariant scar subspaces in a gauge theory with a nontrivial continuum interpretation.

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João Barata, Kiryl Pakrouski, Andrey V. Sadofyev. 2026-09-14. Exact group invariant scar towers in two dimensional gauge theories. https://arxiv.org/abs/2609.16132

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