Physics – Condensed Matter – Superconductivity
Scientific paper
2001-01-03
Phys. Rev. Lett. 86, 5759 (2001)
Physics
Condensed Matter
Superconductivity
4 pages, revtex. Revised version to be published in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.86.5759
We find an integrable generalization of the BCS model with non-uniform 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 diagonalizing them by means of Bethe Ansatz. Uniform pairing and Coulomb interaction are obtained as the ``isotropic limit'' of the Gaudin Hamiltonians. We discuss possible applications of this model to a single grain and to a system of few interacting grains.
Amico Luigi
Lorenzo Antonio Di
Osterloh Andreas
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