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Scaling and Luescher Term in a non-Abelian (2+1)d SU$(2)$ Quantum Link Model
Paul Ludwig, Timo Jakobs, Carsten Urbach·February 26, 2026
hep-latQuantum Physics
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Abstract
We investigate a non-Abelian SU$(2)$ quantum link model in $2+1$ dimensions on a hexagonal lattice using tensor network methods. We determine the static quark potential for a wide range of bare coupling values and find that the theory is confining. We also probe the existence of a Lüscher term and find a clear signal with a $g^2$ dependent coefficient, in qualitative agreement with a strong coupling expansion. Correspondingly, the width of the strings scales logarithmically with the string length again for all $g^2$-values, providing evidence for a rough string, with no indication for a roughening transition.