Chiral spin liquid in a two-dimensional two-component helical magnet

TL;DR

This paper develops a low-temperature method to analyze a two-dimensional two-component helical magnet, revealing four phases including a novel chiral spin liquid with a continuous phase transition characterized by a modified Ising universality class.

Contribution

It introduces a new analytical approach to study phase transitions in helical magnets and identifies a chiral spin liquid phase with unique critical behavior.

Findings

Identification of four distinct phases in the model

Discovery of a chiral spin liquid phase emerging from the paramagnetic phase

Calculation of critical exponents and a new scaling relation for the phase transition

Abstract

A low-temperature method is developed, suited for the two-dimensional two-component classical helical magnet. Four phases on the phase diagram as functions of temperature and helicity parameter of the Hamiltonian are found. Among the three ordered phases two show magnetic order: the usual algebraic correlations of the magnetization and the algebraic correlations of the magnetization in the frame rotating according with the helical order. A chiral spin liquid phase emerges directly from the paramagnetic phase and has a scalar parity-breaking pitch of the magnetization as the order parameter. The chiral phase transition is found to be of a continuous second order type with a modified by the long-range interaction Ising universality class. All the critical exponents are calculated in the second and the third order of an $\epsilon$-expansion. A new scaling relationship replacing the Josephson's one is found.