quantax.operator.sigma_p

quantax.operator.sigma_p(*index) → Operator

\(\sigma^+\) operator for spin systems.

\[\begin{split}\sigma^+ = \begin{pmatrix} 0 & 1 \\ 0 & 0 \end{pmatrix}\end{split}\]

Parameters:

index – Site to act on, as a flat index or lattice coordinates; see the module docstring for the convention.