Dimer and Néel order-parameter fluctuations in the spin-fluid phase of the s=1/2 spin chain with first and second neighbor couplings
arXiv:cond-mat/9604066 · doi:10.1103/PhysRevB.54.9242
Abstract
The dynamical properties at T=0 of the one-dimensional (1D) s=1/2 nearest-neighbor (nn) XXZ model with an additional isotropic next-nearest-neighbor (nnn) coupling are investigated by means of the recursion method in combination with techniques of continued-fraction analysis. The focus is on the dynamic structure factors S_{zz}(q,ω) and S_{DD}(q,ω), which describe (for q=π) the fluctuations of the Néel and dimer order parameters, respectively. We calculate (via weak-coupling continued-fraction analysis) the dependence on the exchange constants of the infrared exponent, the renormalized bandwidth of spinon excitations, and the spectral-weight distribution in S_{zz}(π,ω) and S_{DD}(π,ω), all in the spin-fluid phase, which is realized for planar anisotropy and sufficiently weak nnn coupling. For some parameter values we find a discrete branch of excitations above the spinon continuum. They contribute to S_{zz}(q,ω) but not to S_{DD}(q,ω).
RevTex file (7 pages), 8 figures (uuencoded ps file) available from authors
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Cited by in corpus (9)
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