Quantum Narrowing Effect in a Spin-Peierls System with Quantum Lattice Fluctuation

TL;DR

This paper explores how quantum lattice fluctuations influence magnetic properties in a one-dimensional spin system, revealing a quantum narrowing effect that alters behavior based on lattice mass.

Contribution

It introduces the concept of quantum narrowing in a spin-Peierls system, analyzing how quantum lattice fluctuations affect magnetic properties across different mass regimes.

Findings

Heavy mass system resembles classical lattice vibration behavior.

Light mass system exhibits properties similar to a static uniform chain.

Quantum narrowing explains the transition between these behaviors.

Abstract

We investigate a one-dimensional S=1/2 antiferromagnetic Heisenberg model coupled to quantum lattice vibration using a quantum Monte Carlo method. We study the ground-state lattice fluctuation where the system shows a characteristic structure factor. We also study the mass dependence of magnetic properties such as the magnetic susceptibility and the magnetic excitation spectrum. For heavy mass, the system shows the same behavior as the case of classical lattice vibration. On the other hand, for light mass, magnetic properties coincide with those of the static uniform chain. We investigate the physical mechanism of this behavior and propose the picture of quantum narrowing.