Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-04-17
Phys. Rev. B 76, 184428 (2007)
Physics
Condensed Matter
Strongly Correlated Electrons
Version 4. 8 pages, 15 figures (12 figures in document)
Scientific paper
10.1103/PhysRevB.76.184428
We obtain the phase diagram in the parameter space $(J'/J, \gamma)$ and an accurate estimate of the critical line separating the different phases. We show several measuments of the magnetization, dimerization, nearest neighbours correlation, and density of energy in the different zones of the phase diagram, as well as a measurement of the string order parameter proposed as the non vanishing phase order parameter characterizing Haldane phases. All these results will be compared in the limit $J'/J\gg 1$ with the behaviour of the $\textbf{S}=1$ Bond Alternated Heisenberg Chain (BAHC). The analysis of our data supports the existence of a dimer phase separated by a critical line from a Haldane one, which has exactly the same nature as the Haldane phase in the $\textbf{S}=1$ BAHC.
Almeida Javier
Martin-Delgado Miguel Angel
Sierra German
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