Lplus

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

OppLplus = NewOperator("Lplus", NF, IndexUp, IndexDn)