2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/16573The ground-state ordering and dynamics of the two-dimensional (2D) S=1/2 frustrated Heisenberg antiferromagnet Cs_2CuCl_4 is explored using neutron scattering in high magnetic fields. We find that the dynamic correlations show a highly dispersive continuum of excited states, characteristic of the RVB state, arising from pairs of S=1/2 spinons. Quantum renormalization factors for the excitation energies (1.65) and incommensuration (0.56) are large.4 pages revtex, 3 ps figures, new data added to fig. 1f, includes referees' commentsStrongly Correlated ElectronsStatistical Mechanicstext