Journal
PHYSICAL REVIEW LETTERS
Volume 86, Issue 3, Pages 520-523Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.86.520
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By using perturbation calculation and numerical diagonalization, the low-energy spin dynamics of the Shastry-Sutherland model is investigated with particular attention to the two-particle coherent motion. In addition to spin-singlet- and triplet-bound states, we find novel branches of coherent motion of a bound quintet pair, which are usually unstable because of repulsion. Unusual dispersion observed in neutron-scattering measurements is explained by the present theory. The importance of the effects of phonons is also pointed out.
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