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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 ISSN 1098-0121.

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Official URL: http://dx.doi.org/10.1103/PhysRevB.66.024412

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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:
DateEvent
1 July 2002UNSPECIFIED
Volume: 66
Number: 2
Number of Pages: 28
Page Range: -
DOI: 10.1103/PhysRevB.66.024412
Publication Status: Published

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