Pairing symmetry in a two-orbital Hubbard model on a square lattice

Details Pairing symmetry in a two-orbital Hubbard model on a square lattice Pairing symmetry in a two-orbital Hubbard model on a square lattice

2007-02-27

arxiv.org/abs/cond-mat/0702624v2

Phys. Rev. B 75, 224509 (2007)

Physics

Condensed Matter

Superconductivity

9 pages, 6 figures

Scientific paper

10.1103/PhysRevB.75.224509

We investigate superconductivity in a two-orbital Hubbard model on a square lattice by applying fluctuation exchange approximation. In the present model, the symmetry of the two orbitals are assumed to be that of an s orbital. Then, we find that an s-wave spin-triplet orbital-antisymmetric state and a p-wave spin-singlet orbital-antisymmetric state appear when Hund's rule coupling is large. These states are prohibited in a single-orbital model within states with even frequency dependence, but allowed for multi-orbital systems. We also discuss pairing symmetry in other models which are equivalent to the two-orbital Hubbard model except for symmetry of orbitals. Finally, we show that pairing states with a finite total momentum, even without a magnetic field, are possible in a system with two Fermi-surfaces.

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