static_hamiltonian

property Model.static_hamiltonian: ndarray | Array | None

Static part of the Hamiltonian in the model’s full Hilbert space.

It contains the anisotropy, spin-spin interaction, and static Zeeman terms:

\[H_\text{static} = \sum_i \boldsymbol{S}_i^\mathsf{T} \boldsymbol{D}_i \boldsymbol{S}_i + \sum_{i < j} \boldsymbol{S}_i^\mathsf{T} \boldsymbol{A}_{ij} \boldsymbol{S}_j + \boldsymbol{B}_\text{static} \left[\sum_{i \in \text{electron spins}} \gamma_i \boldsymbol{S}_i - \sum_{i \in \text{nuclear spins}} \gamma_i \boldsymbol{S}_i\right]\]