Integrable Model for Interacting Electrons in Metallic Grains
Integrable Model for Interacting Electrons in Metallic Grains
We find an integrable generalization of the BCS model with nonuniform Coulomb and pairing interaction. The Hamiltonian is integrable by construction since it is a functional of commuting operators; these operators, which therefore are constants of motion of the model, contain the anisotropic Gaudin Hamiltonians. The exact solution is obtained …