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          Institute: MPI für Physik Komplexer Systeme     Collection: Phase transitions and critical phenomena     Display Documents



ID: 479351.0, MPI für Physik Komplexer Systeme / Phase transitions and critical phenomena
Quantum criticalities in a two-leg antiferromagnetic S=1/2 ladder induced by a staggered magnetic field
Authors:Wang, Y. J.; Essler, F. H. L.; Fabrizio, M.; Nersesyan, A. A.
Language:English
Date of Publication (YYYY-MM-DD):2002-07-01
Title of Journal:Physical Review B
Journal Abbrev.:Phys. Rev. B
Volume:66
Issue / Number:2
Sequence Number of Article:024412
Review Status:Peer-review
Audience:Not Specified
Abstract / Description: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.
External Publication Status:published
Document Type:Article
Communicated by:Heidrun Näther
Affiliations:MPI für Physik Komplexer Systeme/Visitors Program
External Affiliations:Abdus Salam Int Ctr Theoret Phys, Strada Costiera 11, I-34014; Trieste, Italy; Abdus Salam Int Ctr Theoret Phys, I-34014 Trieste, Italy; Max Planck Inst Phys Complex Syst, D-01187 Dresden, Germany; Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England; Scuola Int Super Studi Avanzati, I-34014 Trieste, Italy; INFM, I-34014 Trieste, Italy
Identifiers:ISI:000177338400070
ISSN:0163-1829
URL:http://ojps.aip.org/getabs/servlet/GetabsServlet?p...
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