Spin-1 Heisenberg antiferromagnetic chain with exchange and single-ion anisotropies

TL;DR

This study uses density matrix renormalization group calculations to analyze the ground state properties of a spin-1 Heisenberg antiferromagnetic chain with anisotropies, revealing complex phase structures and refining previous Monte Carlo results.

Contribution

It provides a detailed quantum phase diagram of the model, identifying new types of biconical and spin-flop phases, and offers a refined analysis compared to earlier Monte Carlo studies.

Findings

Evidence for two types of biconical (supersolid) phases.

Evidence for two types of spin-flop (superfluid) phases.

Qualitative interpretation of the phase diagram using classical spin models.

Abstract

Using density matrix renormalization group calculations, ground state properties of the spin-1 Heisenberg chain with exchange and single-ion anisotropies in an external field are studied. Our findings confirm and refine recent results by Sengupta and Batista, Physical Review Letters 99, 217205 (2007) (2007), on the same model applying Monte Carlo techniques. In particular, we present evidence for two types of biconical (or supersolid) and for two types of spin-flop (or superfluid) structures. Basic features of the quantum phase diagram may be interpreted qualitatively in the framework of classical spin models.