Dynamics of quantum spin systems in dimer and valence-bond solid ground states stabilized by competing interactions

Details Dynamics of quantum spin systems in dimer and valence-bond solid ground states stabilized by competing interactions Dynamics of quantum spin systems in dimer and valence-bond solid ground states stabilized by competing interactions

1995-08-25

arxiv.org/abs/cond-mat/9508124v1

Physics

Condensed Matter

RevTex file, 3 ps figures

Scientific paper

10.1063/1.361686

For special coupling ratios, the one-dimensional (1D) s=1/2 Heisenberg model with antiferromagnetic nearest and next-nearest neighbor interactions has a pure dimer ground state, and the 1D s=1 Heisenberg model with antiferromagnetic bilinear and biquadratic interactions has an exact valence-bond-solid ground state. The recursion method is used to calculate the T=0 spin dynamic structure factor for both models and, for the s=1/2 model, also the dimer dynamic structure factor. New results for line shapes and dynamically relevant dispersions are obtained.

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