- #1
LagrangeEuler
- 717
- 20
Hamiltonian of interaction between fixed ion and conducting electron
##\hat{H}=-J\sum_{i=1}^2\{\hat{s}_i^z\hat{S}_i^z+\frac{1}{2}(\hat{s}_i^+\hat{S}_i^{-}+\hat{s}_i^-\hat{S}_i^{+})\}##
Why both electron and ion are defined with subscript ##i##?
##\hat{H}=-J\sum_{i=1}^2\{\hat{s}_i^z\hat{S}_i^z+\frac{1}{2}(\hat{s}_i^+\hat{S}_i^{-}+\hat{s}_i^-\hat{S}_i^{+})\}##
Why both electron and ion are defined with subscript ##i##?