Factorized ground state for a general class of ferrimagnets

TL;DR

This paper derives an exact, factorized ground state for a broad class of ferrimagnets, revealing unique excitation dynamics and thermodynamic signatures such as specific heat features.

Contribution

It provides the first exact ground state solution for a general ferrimagnet model with diverse interactions and analyzes the resulting excitation spectrum and thermodynamic behavior.

Findings

Exact factorized ground state found for a broad ferrimagnet class.

Two excitation branches identified, explaining complex dynamics.

Specific heat exhibits characteristic peak and broad bump signatures.

Abstract

We have found the exact (factorized) ground state of a general class of ferrimagnets in the presence of a magnetic field which covers the frustrated, anisotropic and long range interactions for arbitrary dimensional space. In particular cases, our model represents the bond-alternating, ferromagnet-antiferromagnet and also homogeneous spin $s$ model. The factorized ground state is a product of single particle kets on a bipartite lattice composed of two different spins ($\rho, \sigma$). The spin waves analysis around the exact ground state show two branch of excitations which is the origin of two dynamics of the model. The signature of these dynamics is addressed as a peak and a broaden bump in the specific heat.