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Título: | Critical Lines and Massive Phases in Quantum Spin Ladders with Dimerization |
Autor: | Almeida, Javier CSIC; Martín-Delgado, Miguel Ángel; Sierra, Germán CSIC ORCID | Palabras clave: | Strongly Correlated Electrons Dimerized spin ladders DMRG algorithm |
Fecha de publicación: | 6-ago-2007 | Citación: | arXiv:0707.4452v2 [cond-mat.str-el] | Resumen: | We determine the existence of critical lines in dimerized quantum spin ladders in their phase diagram of coupling constants using the finite-size DMRG algorithm. We consider both staggered and columnar dimerization patterns, and antiferromagnetic and ferromagnetic inter-leg couplings. The existence of critical phases depends on the precise combination of these patterns. The nature of the massive phases separating the critical lines are characterized with generalized string order parameters that determine their valence bond solid (VBS) content. | Descripción: | 9 pages, 10 figures.-- PACS numbers: 75.10.Jm 75.10.-b 74.20.Mn.-- Submitted on 30 Jul 2007 (v1), last revised 6 Aug 2007 (this version, v2). | URI: | http://hdl.handle.net/10261/6869 |
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