Chen-Hsuan Hsu, Sudip Chakravarty
A higher angular momentum ($\ell =2$) d-density wave, a mixed triplet and a singlet, interestingly, admits skyrmionic textures. The Skyrmions carry charge $2e$ and can condense into a spin-singlet s-wave superconducting state. The quantum phase transition between this triplet mixed $d$-density wave and skyrmionic superconducting condensate likely leads to deconfined quantum critical point. We make some speculations regarding the connection of this exotic state to electronic materials that are strongly correlated, such as heavy fermions. At the very least, we provide a concrete example in which topological order and broken symmetry are intertwined, which can give rise to non-BCS superconductivity.
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http://arxiv.org/abs/1210.0034
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