quantax.operator.Heisenberg# quantax.operator.Heisenberg(J: Number | Sequence[Number] = 1.0, n_neighbor: int | Sequence[int] = 1, msr: bool = False) → Operator# Heisenberg Hamiltonian \(H = J_n \sum_{<ij>_n} \mathbf{\sigma}_i \cdot \mathbf{\sigma}_j\)