Exact Results on Superconductivity due to Interband Coupling
arXiv:cond-mat/9506011 · doi:10.1103/PhysRevB.53.8561
Abstract
We present a family of exactly solvable models at arbitrary filling in any dimensions which exhibit novel superconductivity with interband pairing. By the use of the hidden $SU(2)$ algebra the Hamiltonians were diagonalized explicitly. The zero-temperature phase diagrams and the thermodynamic properties are discussed. Several new properties are revealed which are different from those of the BCS-type superconductor.