Adjacent spin operator dynamical structure factor of the S=1/2 Heisenberg chain

Considering the adjacent spin operators (SjSj+1z)-S-z and S-j(-) S-j+1(-) in the S = 1/2 Heisenberg chain, we give a determinant representation of their form factors. The dynamical structure factors of the respective operators are computed over the whole Brillouin zone in several magnetic fields and the resulting signal is analyzed in terms of excitation types. Among other results, we find that the (SjSj+1z)-S-z dynamical structure factor carries a large weight of the four-spinon excitations which are distinguishable from the two-spinon signal because they are located outside the two-spinon spectrum.