Universal Magnetic Properties of Frustrated Quantum Antiferromagnets in Two Dimensions

TL;DR

This paper develops a universal theoretical framework for understanding magnetic properties of frustrated two-dimensional quantum antiferromagnets near quantum phase transitions, validated by numerical data on a specific model.

Contribution

It introduces a sigma-model approach for bosonic spinons to describe universal scaling near quantum critical points in 2D frustrated antiferromagnets.

Findings

Derived universal scaling forms for observables

Compared theoretical predictions with numerical data

Validated the theory on the spin-1/2 triangular antiferromagnet

Abstract

We present a theory of frustrated, two-dimensional, quantum antiferromagnets in the vicinity of a quantum transition from a non-collinear, magnetically-ordered ground state to a quantum-disordered phase. Using a sigma-model for bosonic, spin-1/2, spinon fields, we obtain universal scaling forms for a variety of observables. Our results are compared with numerical data on the spin-1/2 triangular antiferromagnet.