quantax.operator.Hubbard# quantax.operator.Hubbard(U: float, t: float | Sequence[float] = 1.0, n_neighbor: int | Sequence[int] = 1) → Operator# Hubbard Hamiltonian \(H = -\sum_n t_n \sum_{\left< ij \right>_n} \sum_{s \in \{ā,ā\}} (c_{i,s}^ā c_{j,s} + c_{j,s}^ā c_{i,s}) + U \sum_i n_{iā} n_{iā}\)