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arXiv · 2607.21798

Spectral Gap of the Davies Generator for the Mean-Field Heisenberg Model

Joao Basso·Thiago Bergamaschi·Lin Lin·Michael Ragone·Kevin D. Stubbs
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Abstract

The mean-field Heisenberg ferromagnet is a quantum spin model on the complete graph with isotropic spin-1/2 interactions. This non-commuting Hamiltonian is permutation and $\mathsf{SU}(2)$ invariant, and its Gibbs states undergo an $\mathsf{SU}(2)$ symmetry breaking phase transition at inverse temperature $\beta=2$. We consider the associated Davies generator, a canonical model of open-system thermalization, and prove tight asymptotic estimates for its spectral gap at all noncritical temperatures. For fixed $\beta<2$, the gap as a function of number of qubits $n$ is $\Theta(1)$, while for fixed $\beta>2$ the gap is $\Theta(n^{-1})$. The matching upper bound of the spectral gap is witnessed by the total magnetization order parameter, suggesting that the low-temperature ($\beta>2$) slowdown is associated with broken continuous symmetry. Two key ingredients in our approach are a comparison argument, which introduces auxiliary generators to bound dissipation on nontrivial representations of the symmetry groups $\mathsf{SU}(2)$ and $\mathsf{S}_n$, and a decomposition of the space of observables into spherical tensor operators to reveal a form of monotonicity.

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Joao Basso, Thiago Bergamaschi, Lin Lin, Michael Ragone, Kevin D. Stubbs. 2026-07-23. Spectral Gap of the Davies Generator for the Mean-Field Heisenberg Model. https://arxiv.org/abs/2607.21798

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