Numerical Study of Excited States in the Shastry-Sutherland Model

Details Numerical Study of Excited States in the Shastry-Sutherland Model Numerical Study of Excited States in the Shastry-Sutherland Model

2002-10-28

arxiv.org/abs/cond-mat/0210602v1

Physics

Condensed Matter

Strongly Correlated Electrons

15pages, 5figures to be published in JPSJ

Scientific paper

10.1143/JPSJ.72.160

We investigate excited states of the Shastry-Sutherland model using a kind of variational method. Starting from various trial states which include one or two triplet dimers, we numerically pursue the best evaluation of the energy for each set of quantum numbers. We present the energy difference as a function of either the coupling ratio or the momentum and compare them with the perturbative calculations. Our data suggest that the helical order phase exists between the singlet dimer phase and the magnetically ordered phase. In comparison with the experimental data we can estimate the intra-dimer coupling J and the inter-dimer coupling J' for SrCu2(BO3)2 : J'/J =0.65 and J = 87K.

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