NEUTRON-SCATTERING CROSS-SECTION OF THE S = 1 2 HEISENBERG TRIANGULARANTIFERROMAGNET/

In this paper we use a Schwinger-boson mean-field approach to calculat e the neutron-scattering cross section from the S = 1/2 antiferromagne t with nearest-neighbor isotropic Heisenberg interaction on a two-dime nsional triangular lattice. We investigate two solutions for T = 0: (i ) a state with long-range order resembling the Neel state and (ii) a r esonating valence bond or ''spin liquid'' state with an energy gap, E( g) almost-equal-to 0.17J, for the elementary excitations (spinons). Fo r solution (ii) the neutron cross section shows Bragg rods at kappa = K = (1/3, 1/3), whereas solution (ii) shows no elastic, but a set of b roader dispersive spin excitations around kappa almost-equal-to (1/2, 0) and around kappa almost-equal-to (1/3, 1/3) for omega/E(g) = 2.5-4. It should thus be possible to distinguish these two states in a neutr on-scattering experiment.