Integrability of a disordered Heisenberg spin-1/2 chain

Details Integrability of a disordered Heisenberg spin-1/2 chain Integrability of a disordered Heisenberg spin-1/2 chain

2003-10-02

arxiv.org/abs/cond-mat/0310035v1

Physics

Condensed Matter

4 pages, 4 figures

Scientific paper

10.1088/0305-4470/37/17/004

We investigate how the transition from integrability to nonintegrability occurs by changing the parameters of the Hamiltonian of a Heisenberg spin-1/2 chain with defects. Randomly distributed defects may lead to quantum chaos. A similar behavior is obtained in the presence of a single defect out of the edges of the chain, suggesting that randomness is not the cause of chaos in these systems, but the mere presence of a defect.

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