Fig. 5

Calculated bimagnon correlations. (a,b) Bimagnon correlations \(M(\textbf{q}, \omega )\) with selected \(\textbf{q}\) for \(A_{1g}\) and \(B_{1g}\), respectively. \(M(\textbf{q}, \omega )\) were calculated through \(\sum _{f}|\langle {f}|M_{\bf{q}}^{\pm }|0\rangle |^2\delta (\omega -E_{f}+E_{0})\), where \(|0\rangle\) and \(|f\rangle\) represent, respectively, the ground and final states of energy \(E_0\) and \(E_f\). The spectra are presented by the calculated spectral weights, i.e., the \(\delta\)-functions shown by the vertical thin solid lines, after convolution with Lorentzian broadening of 0.2t. Spectra are vertically offset for clarity.