Realization of a Spin liquid in a Two Dimensional Quantum Antiferromagnet

TL;DR

This paper investigates the ground state of a 2D anisotropic Heisenberg model, providing evidence for a disorder transition at high anisotropy and characterizing the disordered phase as gapless and chain-like.

Contribution

It demonstrates the existence of a disorder transition induced by anisotropy and characterizes the disordered phase as gapless and effectively one-dimensional.

Findings

Disorder transition occurs at $J_y/J_x < 0.1$

Disordered phase is gapless

Disordered phase resembles decoupled 1D chains

Abstract

The ground state properties of the two dimensional spatially anisotropic Heisenberg model are investigated by use of field theory mappings, spin-wave expansion and Lanczos technique. Evidence for a disorder transition induced by anisotropy at about $J_y/J_x < 0.1$ is shown. We argue that the disordered phase is gapless and its long wavelength properties can be interpreted in terms of decoupled one dimensional chains.