Integrable-chaos crossover in the spin-1∕2 XXZ chain with cluster interaction

S. Moshfegh, A. Ashouri, S. Mahdavifar and J. Vahedi

Physica A: Statistical Mechanics and its Applications, 2019, vol. 516, issue C, 502-508

Abstract: Recent progress in the field of quantum magnets has shown that a wide variety of novel spin model can be generated with exploiting the optical lattices. Among them the spin cluster interaction gets some attention. In this work, we have considered a spin-1∕2 XXZ Heisenberg chain with added cluster interaction. In the absence of the cluster interaction, the XXZ chain is solvable by Bethe ansatz. Introducing a small defect in the middle of chain drives the XXZ model to the chaotic phase not for strong anisotropic parameter. Using the numerical full diagonalization method, we have shown that in presence of a cluster interaction, how quantum chaos may develop even for strong Ising interaction region. In addition, the effect of the cluster length and strength on the crossover from the integrable to the chaotic regime is also addressed.

Keywords: Quantum chaos; Cluster interaction; Spin-1/2 XXZ chain (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:516:y:2019:i:c:p:502-508

DOI: 10.1016/j.physa.2018.10.046

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