The spin-Peierls chain revisited

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We extend previous analytical studies of the ground-state phase diagram of a one-dimensional Heisenberg spin chain coupled to optical phonons, which for increasing spin-lattice coupling undergoes a quantum phase transition from a gap-less to a gaped phase with finite lattice dimerisation. We check the analytical results against established four-block and new two-block density matrix renormalisation group (DMRG) calculations. Different finite-size scaling behaviour of the spin excitation gaps is found in the adiabatic and anti-adiabatic regimes.
2 pages, 1 figure, submitted to ICM 2006

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Strongly Correlated Electrons, Statistical Mechanics

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http://salesiana.dossiersoluciones.com/handle/123456789/133372

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0606360
 http://arxiv.org/abs/cond-mat/0606360
 JMMM 310, 1380 (2007); Erratum: JMMM 316, 43 (2007)
 doi:10.1016/j.jmmm.2006.10.399

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arXiv