Optimized perturbation theory for molecular antiferromagnets

TL;DR

This paper introduces an optimized perturbation approach for mesoscopic antiferromagnets, utilizing eigenstates of the rotational band Hamiltonian to efficiently approximate their energy spectra.

Contribution

It proposes a novel perturbation method based on rotational band eigenstates for better spectral approximation of mesoscopic antiferromagnets.

Findings

Eigenstates of the rotational band Hamiltonian are effective basis sets.

The method simplifies the calculation of energy spectra.

Applicable to various mesoscopic quantum systems.

Abstract

The energy spectra of mesoscopic, i.e. few-body quantum systems are of great interest in several areas of physics such as nuclear physics, cluster physics or magnetism. One way to obtain an approximate spectrum is to diagonalize with reduced but carefully chosen basis sets. In this Letter we propose for the case of mesoscopic antiferromagnets to use the eigenstates of the rotational band Hamiltonian for this purpose. These states are not only well adapted, they can also be easily constructed.