✦ LIBER ✦

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

✍ Scribed by W.Vincent Liu

Publisher: Elsevier Science
Year: 1999
Tongue: English
Weight: 66 KB
Volume: 260
Category: Article
ISSN: 0375-9601
DOI: 10.1016/s0375-9601(99)00493-4

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✦ Synopsis

The coexistence of superconducting and charge-density-wave order in the half-filled attractive Hubbard model is Ž . Ž . 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 s-model. Unlike the spin textures previously known in an antiferromagnetic background, doping the model away from half-filling leads the new skyrmions to unwrap.