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Paper detail

Heisenberg models and Schur--Weyl duality

We present a detailed analysis of certain quantum spin systems with inhomogeneous (non-random) mean-field interactions. Examples include, but are not limited to, the interchange- and spin singlet projection interactions on complete bipartite graphs. Using two instances of the representation theoretic framework of Schur--Weyl duality, we can explicitly compute the free energy and other thermodynamic limits in the models we consider. This allows us to describe the phase-transition, the ground-state phase diagram, and the expected structure of extremal states.

preprint2022arXivOpen access
Jakob BjörnbergHjalmar RosengrenKieran Ryan
math-phmath.PRmath.MP
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Jakob BjörnbergHjalmar RosengrenKieran Ryan

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