Ground-state properties of the spin-1/2 Heisenberg-Ising bond alternating chain with Dzyaloshinskii-Moriya interaction

TL;DR

This paper exactly calculates the ground-state energy of a spin-1/2 Heisenberg-Ising alternating chain with Dzyaloshinskii-Moriya interaction, revealing nonanalytic behavior and gapless excitations under specific conditions.

Contribution

It provides an exact solution for the ground-state energy of a complex quantum spin chain with Dzyaloshinskii-Moriya interaction, highlighting critical behavior.

Findings

Ground-state energy calculated exactly.

Identification of nonanalytic behavior under certain conditions.

Presence of gapless excitation spectrum.

Abstract

Ground-state energy is exactly calculated for the spin-1/2 Heisenberg-Ising bond alternating chain with the Dzyaloshinskii-Moriya interaction. Under certain condition, which relates a strength of the Ising, Heisenberg and Dzyaloshinskii-Moriya interactions, the ground-state energy exhibits an interesting nonanalytic behavior accompanied with a gapless excitation spectrum.