Large- N estimates of universal amplitudes of the C PN-1 theory and comparison with a S= 1 2 square-lattice model with competing four-spin interactions

Ribhu K. Kaul, Roger G. Melko

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29 Scopus citations

Abstract

We present computations of certain finite-size scaling functions and universal amplitude ratios in the large- N limit of the C PN-1 field theory. We pay particular attention to the uniform susceptibility, the spin stiffness, and the specific heat. Field theoretic arguments have shown that the long-wavelength description of the phase transition between the Néel and valence-bond solid states in square lattice S=1/2 antiferromagnets is expected to be the noncompact C P1 field theory. We provide a detailed comparison between our field theoretic calculations and quantum Monte Carlo data close to the Néel-VBS transition on a S=1/2 square-lattice model with competing four-spin interactions (the JQ model).

Original languageEnglish
Article number014417
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume78
Issue number1
DOIs
StatePublished - Jul 15 2008

Funding

FundersFunder number
U.S. Department of Energy Chinese Academy of Sciences Guangzhou Municipal Science and Technology Project Oak Ridge National Laboratory Extreme Science and Engineering Discovery Environment National Science Foundation National Energy Research Scientific Computing Center National Natural Science Foundation of China0537077, 0541988, 0132874

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

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