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

Wang, Y. J.; Essler, F. H. L.; Fabrizio, M.; Nersesyan, A. A.

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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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Wang, Y. J.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Citation

Wang, Y. J., Essler, F. H. L., Fabrizio, M., & Nersesyan, A. A. (2002). Quantum criticalities in a two-leg antiferromagnetic S=1/2 ladder induced by a staggered magnetic field. Physical Review B, 66(2): 024412. Retrieved from http://ojps.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRBMDO000066000002024412000001&idtype=cvips&gifs=yes&jsessionid=2466931055860381782.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002B-3745-4

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.