Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2003-08-06
Phys. Rev. B 68, 052510 (2003)
Physics
Condensed Matter
Statistical Mechanics
4 pages, 4 figures, to be published in Physical Review B
Scientific paper
10.1103/PhysRevB.68.052510
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.
Deguchi Tetsuo
Kudo Kazue
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