Bound states in weakly disordered spin ladders

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We study the appearance of bound states in the spin gap of spin-1/2 ladders induced by weak bond disorder. Starting from the strong-coupling limit, i.e., the limit of weakly coupled dimers, we perform a projection on the single-triplet subspace and derive the position of bound states for the single impurity problem of one modified coupling as well as for small impurity clusters. The case of a finite concentration of impurities is treated with the coherent-potential approximation in the strong-coupling limit and compared with numerical results. Furthermore, we analyze the details in the structure of the density of states and relate their origin to the influence of impurity clusters.
2 pages, 1 figure. Proceedings of SCES'04, to appear in Physica B

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Strongly Correlated Electrons, Disordered Systems and Neural Networks

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http://salesiana.dossiersoluciones.com/handle/123456789/25390

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0411751
 http://arxiv.org/abs/cond-mat/0411751
 Physica B 359-361, 1424 (2005)
 doi:10.1016/j.physb.2005.01.435

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arXiv