Effect of Hund coupling in the one-dimensional SU(4) Hubbard model

Details Effect of Hund coupling in the one-dimensional SU(4) Hubbard model Effect of Hund coupling in the one-dimensional SU(4) Hubbard model

2003-09-30

arxiv.org/abs/cond-mat/0310003v1

Phys. Rev. B69, 155109 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 1 figure

Scientific paper

10.1103/PhysRevB.69.155109

The one-dimensional SU(4) Hubbard model perturbed by Hund coupling is studied, away from half-filling, by means of renormalization group and bosonization methods. A spectral gap is always present in the spin-orbital sector irrespective of the magnitude of the Coulomb repulsion. We further distinguish between two qualitatively different regimes. At small Hund coupling, we find that the symmetry of the system is dynamically enlarged to SU(4) at low energy with the result of {\it coherent} spin-orbital excitations. When the charge sector is not gapped, a superconducting instability is shown to exist. At large Hund coupling, the symmetry is no longer enlarged to SU(4) and the excitations in the spin sector become {\it incoherent}. Furthermore, the superconductivity can be suppressed in favor of the conventional charge density wave state.

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