Spin Ladder with Anisotropic Ferromagnetic Legs in a Transverse Magnetic Field

TL;DR

This paper investigates the phase diagram of a two-leg spin ladder with anisotropic ferromagnetic legs under a transverse magnetic field, revealing multiple phase transitions using exact diagonalization.

Contribution

It provides the first detailed analysis of phase transitions in a spin ladder with anisotropic ferromagnetic legs under transverse magnetic fields.

Findings

Identified two phase transitions: from rung-singlet to stripe-ferromagnetic phase.

Transition from stripe-ferromagnetic to fully polarized ferromagnetic phase.

Phase diagram mapped in magnetic field vs interchain coupling plane.

Abstract

We study the ground state phase diagram of a two-leg spin ladder with anisotropic ferromagnetic leg couplings under the influence of a symmetry breaking transverse magnetic field by the exact diagonalization technique. In the case of antiferromagnetic coupling between legs we identified two phase transitions in the plane of magnetic field vs interchain coupling strength. The first one corresponds to the transition from the gapped rung-singlet phase to the gapped stripe-ferromagnetic phase. The second one represents the transition from the gapped stripe-ferromagnetic phase into the fully polarized ferromagnetic phase.