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

摘要

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 subpercent 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 models with two parameters.