Quantum criticalities in a two-leg antiferromagnetic S=1/2 ladder induced by a staggered magnetic field

Details Quantum criticalities in a two-leg antiferromagnetic S=1/2 ladder induced by a staggered magnetic field Quantum criticalities in a two-leg antiferromagnetic S=1/2 ladder induced by a staggered magnetic field

2001-12-13

arxiv.org/abs/cond-mat/0112249v1

Physics

Condensed Matter

Strongly Correlated Electrons

29 pages of revtex, 10 figures

Scientific paper

10.1103/PhysRevB.66.024412

We study a two-leg antiferromagnetic spin-1/2 ladder in the presence of a staggered magnetic field. We consider two parameter regimes: strong (weak) coupling along the legs and weak (strong) coupling along the rungs. In both cases, the staggered field drives the Haldane spin-liquid phase of the ladder towards a Gaussian quantum criticality. In a generalized spin ladder with a non-Haldane, spontaneously dimerized phase, the staggered magnetic field induces an Ising quantum critical regime. In the vicinity of the critical lines, we derive low-energy effective field theories and use these descriptions to determine the dynamical response functions, the staggered spin susceptibility and the string order parameter.

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