Unexpected non-Wigner behavior in level-spacing distributions of next-nearest-neighbor coupled XXZ spin chains

Kazue Kudo and Tetsuo Deguchi
Phys. Rev. B 68, 052510 – Published 25 August 2003
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Abstract

The level-spacing distributions of XXZ spin chains with next-nearest-neighbor couplings are studied under periodic boundary conditions. We confirm that integrable XXZ spin chains mostly have the Poisson distribution as expected. On the contrary, the level-spacing distributions of next-nearest-neighbor coupled XXZ chains are given by non-Wigner distributions. It is against the expectations, since the models are nonintegrable.

  • Received 8 May 2003

DOI:https://doi.org/10.1103/PhysRevB.68.052510

©2003 American Physical Society

Authors & Affiliations

Kazue Kudo*

  • Graduate School of Humanities and Sciences, Ochanomizu University, 2-1-1 Ohtsuka, Bunkyo-ku, Tokyo 112-8610, Japan

Tetsuo Deguchi

  • Department of Physics, Ochanomizu University, 2-1-1 Ohtsuka, Bunkyo-ku, Tokyo 112-8610, Japan

  • *Electronic address: kudo@degway.phys.ocha.ac.jp
  • Electronic address: deguchi@phys.ocha.ac.jp

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Vol. 68, Iss. 5 — 1 August 2003

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