Quantum-to-classical correspondence in two-dimensional Heisenberg models*

The quantum-to-classical correspondence (QCC) in spin models is a puzzling phenomenon
where the static susceptibility of a quantum system agrees with its classical-system counterpart,
at a different corresponding temperature, within the systematic error at a sub-percent level.
We employ the bold diagrammatic Monte Carlo method to explore the universality of QCC by
considering three different two-dimensional spin-1/2 Heisenberg models. In particular,
we reveal the existence of QCC in two-parametric models.