quantax.operator.Hubbard

quantax.operator.Hubbard(U: Number, t: Number | Sequence[Number] = 1.0, n_neighbor: int | Sequence[int] = 1) → Operator

Hubbard Hamiltonian \(H = -\sum_n t_n \sum_{\left< ij \right>_n} \sum_{s \in \{↑,↓\}} (c_{i,s}^† c_{j,s} + c_{j,s}^† c_{i,s}) + U \sum_i n_{i↑} n_{i↓}\)