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

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Hiroaki Onishi¹^,²^,³, and Seiji Miyashita¹

+ Affiliations

¹Department of Applied Physics, Graduate School of Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656²Advanced Science Research Center, Japan Atomic Energy Research Institute, 2-4 Shirakata Shirane, Tokai-mura, Naka-gun, Ibaraki 319-1195³Department of Earth and Space Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama-cho, Toyonaka, Osaka 560-0043

Received May 31, 2002

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.

https://doi.org/10.1143/JPSJ.72.392

KEYWORDS: spin–Peierls transition, quantum lattice fluctuation, quantum narrowing effect, quantum Monte Carlo method, loop algorithm

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

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