quantax.operator.S_m# quantax.operator.S_m(*index) → Operator# \(S^-\) operator \[\begin{split}S^- = \begin{pmatrix} 0 & 0 \\ 1 & 0 \end{pmatrix}\end{split}\] Parameters: index – Site to act on, as a flat index or lattice coordinates; see the module docstring for the convention.