Splus

The $S^+$ operator is defined as: \begin{equation} S^+ = \sum_{\tau} a^{\dagger}_{\tau\uparrow}a^{\phantom{\dagger}}_{\tau\downarrow}. \end{equation} The equivalent operator in Quanty is created by:

Example.Quanty

OppSplus = NewOperator("Splus", NF, IndexUp, IndexDn)