quantax.operator.tJ

quantax.operator.tJ(J: Number | Sequence[Number], J_neighbor: int | Sequence[int] = 1, t: Number | Sequence[Number] = 1.0, t_neighbor: int | Sequence[int] = 1) → Operator

t-J Hamiltonian \(H = -\sum_n t_n \sum_{\left< ij \right>_n} \sum_{s \in \{↑,↓\}} (c_{i,s}^† c_{j,s} + c_{j,s}^† c_{i,s}) + \sum_m J_m \sum_{\left< ij \right>_m} (\mathbf{S}_i \cdot \mathbf{S}_j - \frac{1}{4} n_i n_j)\)