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Quantum criticalities in a two-leg antiferromagnetic S=1/2 ladder induced by a staggered magnetic field
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UNSPECIFIED (2002) Quantum criticalities in a two-leg antiferromagnetic S=1/2 ladder induced by a staggered magnetic field. PHYSICAL REVIEW B, 66 (2). -. doi:10.1103/PhysRevB.66.024412
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Official URL: http://dx.doi.org/10.1103/PhysRevB.66.024412
Abstract
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.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics | ||||
| Journal or Publication Title: | PHYSICAL REVIEW B | ||||
| Publisher: | AMERICAN PHYSICAL SOC | ||||
| ISSN: | 1098-0121 | ||||
| Official Date: | 1 July 2002 | ||||
| Dates: |
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| Volume: | 66 | ||||
| Number: | 2 | ||||
| Number of Pages: | 28 | ||||
| Page Range: | - | ||||
| DOI: | 10.1103/PhysRevB.66.024412 | ||||
| Publication Status: | Published |
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