Spin Dynamics in the Two-Dimensional Spin 1/2 Heisenberg Antiferromagnet

TL;DR

This paper investigates the low-temperature spin dynamics of the 2D S=1/2 Heisenberg antiferromagnet using a combined projection operator and modified spin-wave theory, revealing a double peak in the dynamic correlation function.

Contribution

It introduces a novel approach combining projection operator formalism with MSW to analyze dynamic properties and compare with experimental and other theoretical results.

Findings

Dynamic correlation function exhibits a double peak structure.

Calculated spin-wave damping aligns with experimental data.

Method provides insights into finite-temperature gap effects.

Abstract

We present low-temperature dynamic properties of the quantum two-dimensional antiferromagnetic Heisenberg model with spin S=1/2. The calculation of the dynamic correlation function is performed by combining a projection operator formalism and the modified spin-wave theory (MSW), which gives a gap in the dispersion relation for finite temperatures. The so calculated dynamic correlation function shows a double peak structure.We also obtain the spin-wave damping and compare our results to experimental data and to theoretical results obtained by other authors using different approaches.