New skyrmions in the attractive Hubbard model with broken SO(4) symmetry

Details New skyrmions in the attractive Hubbard model with broken SO(4) symmetry New skyrmions in the attractive Hubbard model with broken SO(4) symmetry

1999-03-23

arxiv.org/abs/cond-mat/9903355v2

Phys. Lett. A 260, 94 (1999)

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 1 table, final version to be published in Phys. Lett. A

Scientific paper

10.1016/S0375-9601(99)00493-4

The coexistence of superconducting and charge-density-wave order in the half-filled attractive Hubbard model is interpreted as a consequence of the pseudospin SU(2) symmetry spontaneously broken to a `hidden' subgroup U(1). By topological arguments we show that there must exist new skyrmion textures associated with this symmetry breakdown. This fact is illustrated via a non-linear $\sigma$-model. Unlike the spin textures previously known in an antiferromagnetic background, doping the model away from half-filling leads the new skyrmions to unwrap.

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