Direct Evidence for the Localized Single-Triplet Excitations and the Dispersive Multitriplet Excitations in
- 19 June 2000
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 84 (25) , 5876-5879
- https://doi.org/10.1103/physrevlett.84.5876
Abstract
We performed inelastic neutron scattering on the 2D Shastry-Sutherland system with an exact dimer ground state. Three energy levels at around 3, 5, and 9 meV were observed at 1.7 K. The lowest excitation at 3.0 meV is almost dispersionless with a bandwidth of 0.2 meV at most, showing a significant constraint on a single-triplet hopping owing to the orthogonality of the neighboring dimers. In contrast, the correlated two-triplet excitations at 5 meV exhibit a more dispersive behavior.
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