期刊
JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL
卷 37, 期 17, 页码 4723-4729出版社
IOP PUBLISHING LTD
DOI: 10.1088/0305-4470/37/17/004
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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 behaviour 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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