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New skyrmions in the attractive Hubbard model with broken SO(4) symmetry | | W. Vincent Liu
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23 Mar 1999 | | Journal: | Phys. Lett. A 260, 94 (1999) | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | Affiliation: | University of Texas | | Abstract: | 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. | | Source: | arXiv, cond-mat/9903355 | | Services: | Forum | Review | PDF | Favorites | |
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