Quantum phase transitions in a new exactly solvable quantum spin biaxial model with multiple spin interactions

TL;DR

This paper introduces a new exactly solvable quantum spin model with biaxial anisotropy and multiple spin interactions, revealing quantum phase transitions and critical points influenced by external magnetic fields.

Contribution

It presents a novel integrable spin model allowing exact analysis of thermodynamic properties and quantum phase transitions with multiple spin couplings.

Findings

Exact thermodynamic characteristics derived

Ground state exhibits spontaneous magnetic moments

Multiple quantum critical points identified

Abstract

The new integrable quantum spin model is proposed. The model has a biaxial magnetic anisotropy of alternating coupling between spins together with multiple spin interactions. Our model gives the possibility to exactly find thermodynamic characteristics of the considered spin chain. The ground state of the model can reveal spontaneous values of the total magnetic and antiferromagnetic moments, caused by multiple spin couplings. Also, in the ground state, depending on the strength of multiple spin couplings, our model manifests several quantum critical points, some of which are governed by the external magnetic field.