Phase diagrams of the generalized spin-1/2 ladder under staggered field and dimerization: A renormalization group study

Details Phase diagrams of the generalized spin-1/2 ladder under staggered field and dimerization: A renormalization group study Phase diagrams of the generalized spin-1/2 ladder under staggered field and dimerization: A renormalization group study

2003-06-13

arxiv.org/abs/cond-mat/0306364v1

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 9 figures

Scientific paper

10.1103/PhysRevB.68.214428

In the weak-coupling regime of the continuous theories, two sets of one-loop renormalization group equations are derived and solved to disclose the phase diagrams of the antiferromagnetic generalized two-leg spin-1/2 ladder under the effect of (I) a staggered external magnetic field and (II) an explicit dimerization. In model (I), the splitting of the SU(2)$_2$ critical line into U(1) and Z$_2$ critical surfaces is observed; while in model (II), two critical surfaces arising from their underlying critical lines with SU(2)$_2$ and Z$_2$ characteristics merge into an SU(2)$_1$ critical surface on the line where the model attains its highest symmetry.

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