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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). -. ISSN 1098-0121
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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 |
| Date: | 1 July 2002 |
| Volume: | 66 |
| Number: | 2 |
| Number of Pages: | 28 |
| Page Range: | - |
| Identification Number: | 10.1103/PhysRevB.66.024412 |
| Publication Status: | Published |
| URI: | http://wrap.warwick.ac.uk/id/eprint/10672 |
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