Quantum chaos in spin-1/2 two-leg ladders

A. Ashouri, S. Mahdavifar and J. Vahedi

Chaos, Solitons & Fractals, 2018, vol. 113, issue C, 115-124

Abstract: In this paper, we study numerically the emergence of quantum chaos in the antiferromagnetic (AF) Heisenberg two-leg spin-1/2 ladder. We investigate the mutual effects of magnetic defects and couplings (rung or leg) on the statistical properties of the energy spectrum using the exact diagonalization technique. The system is chaotic when the leg and rung coupling strengths are equal, and even adding a strong magnetic defect does not change the energy distribution. Introducing two defects also does not change the level spacing distribution. We conclude that the system not strongly depend on the number of defects. However, when one of the couplings (rung or leg) is much larger than the other, level spacing distribution shows a profound dependence on it and a transition from chaotic to the integrable regime is found.

Keywords: Two-leg ladders; spin-1/2; quantum chaos (search for similar items in EconPapers)
Date: 2018
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0960077918303138
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:chsofr:v:113:y:2018:i:c:p:115-124

DOI: 10.1016/j.chaos.2018.05.024

Access Statistics for this article

Chaos, Solitons & Fractals is currently edited by Stefano Boccaletti and Stelios Bekiros

More articles in Chaos, Solitons & Fractals from Elsevier
Bibliographic data for series maintained by Thayer, Thomas R. ().