Creates the single-site raising operator \( S^+ \), from which we can define \( S^- = (S^+)^\dagger \). This is represented by the matrix \begin{align} S^+ &= \begin{pmatrix} 0 & 1 \\ 0 & 0 \end{pmatrix}, \end{align} This is represented by the matrix \begin{align} S^+ &= \sqrt{2} \begin{pmatrix} 0 & 1 & 0 \\ 0 & 0 & 1 \\ 0 & 0 & 0 \end{pmatrix}, \end{align} Definition at line 1169 of file DMRGBlock.cpp. Referenced by Initialize(), and loc_qn_size(). |