radtools.MagnonDispersion.C

method

MagnonDispersion.C()

Computes C matrix.

\[C^{i,j} = \delta_{i,j}\sum_{l}S_l \boldsymbol{v}^T_i\boldsymbol{J}_{i, l}(\boldsymbol{0})\boldsymbol{v}_l\]

where indices \(i\) and \(j\) correspond to the atoms in the exchange pair.