Critical Lines and Massive Phases in Quantum Spin Ladders with Dimerization

Details Critical Lines and Massive Phases in Quantum Spin Ladders with Dimerization Critical Lines and Massive Phases in Quantum Spin Ladders with Dimerization

2007-07-30

arxiv.org/abs/0707.4452v2

Phys. Rev. B 77, 094415 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages 10 figures

Scientific paper

10.1103/PhysRevB.77.094415

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.

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