Creates the single-site \( S^z \) operator. This is represented by the matrix \begin{align} S^z &= \frac{1}{2} \begin{pmatrix} 1 & 0 \\ 0 & -1 \end{pmatrix} \end{align} This is represented by the matrix \begin{align} S^z &= \begin{pmatrix} 1 & 0 & 0 \\ 0 & 0 & 0 \\ 0 & 0 & -1 \end{pmatrix} \end{align} Definition at line 1106 of file DMRGBlock.cpp. Referenced by Initialize(), and loc_qn_size(). |