Lmin

The $L^-$ operator is defined as: $$\begin{equation} L^- = \sum_{m=-l}^{m=l}\sum_{\sigma} \sqrt{l-m+1}\sqrt{l+m} \, a^{\dagger}_{m-1,\sigma}a^{\phantom{\dagger}}_{m,\sigma}. \end{equation}$$ The equivalent operator in Quanty is created by:

Example.Quanty

OppLmin = NewOperator("Lmin", NF, IndexUp, IndexDn)