Order-parameter fluctuations in the frustrated Heisenberg model on the square lattice

TL;DR

This study investigates the zero-temperature dynamics of a frustrated 2D Heisenberg model on a square lattice, revealing tendencies towards collinear and dimer orders through analysis of order-parameter fluctuations.

Contribution

It applies the recursion method to analyze frequency-dependent order-parameter fluctuations, providing new insights into the ordering tendencies of the frustrated Heisenberg model.

Findings

Strong indication of collinear order at J2/J1 > 0.6

Potential for dimer order at 0.5 < J2/J1 < 0.6

Weak chiral ordering tendency observed

Abstract

The $T=0$ dynamics of the two-dimensional $s=1/2$ Heisenberg model with competing nearest-neighbor $(J_1)$ and next-nearest-neighbor $(J_2)$ interactions is explored via the recursion method, specifically the frequency-dependent fluctuations of the order parameters associated with some of the known or suspected ordering tendencies in this system, i.e. N\'eel, collinear, dimer, and chiral order. The results for the dynamic structure factors of the respective fluctuation operators show a strong indication of collinear order at $J_2/J_1 \gtrsim 0.6$ and a potential for dimer order at $0.5 \lesssim J_2/J_1 \lesssim 0.6$, whereas the chiral ordering tendency is observed to be considerably weaker.