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Title

Critical Lines and Massive Phases in Quantum Spin Ladders with Dimerization

AuthorsAlmeida, Javier CSIC; Martín-Delgado, Miguel Ángel; Sierra, Germán CSIC ORCID
KeywordsStrongly Correlated Electrons
Dimerized spin ladders
DMRG algorithm
Issue Date6-Aug-2007
CitationarXiv:0707.4452v2 [cond-mat.str-el]
AbstractWe 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.
Description9 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).
URIhttp://hdl.handle.net/10261/6869
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