Quantum phase transitions in a spin-1/2 alternating Heisenberg antiferromagnetic chain under a staggered transverse magnetic field

TL;DR

This paper investigates quantum phase transitions in a spin-1/2 alternating Heisenberg antiferromagnetic chain subjected to a staggered transverse magnetic field, revealing complex phase behaviors through numerical and analytical methods.

Contribution

It introduces a detailed analysis of phase transitions in the model using density-matrix renormalization group and Jordan-Wigner transformation, highlighting new quantum phenomena.

Findings

Identification of quantum phase transitions in S=1 Neel and XY-like phases

Comparison of numerical results with mean-field and exact solutions

Observation of competition effects between field and magnetic order

Abstract

The magnetic behaviors of a spin-1/2 alternating Heisenberg antiferromagnetic chain in a staggered transverse magnetic field is studied by means of the density-matrix renormalization group method and Jordan-Wigner transformation. Quantum phase transitions of different types are observed in the S=1 Neel and XY-like gapless phases, which result from the competitions between the staggered transverse field and magnetic orders induced by anisotropy and alternating interactions. The results are compared with the mean-field and some exactly resolved results.