Charge-2e skyrmion condensate in a hidden-order state

@article{Hsu2013Charge2eSC,
  title={Charge-2e skyrmion condensate in a hidden-order state},
  author={Chen-Hsuan Hsu and Sudip Chakravarty},
  journal={Physical Review B},
  year={2013},
  volume={87},
  pages={085114}
}
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. In addition, a charge current can be induced by a time-dependent inhomogeneous spin texture, leading to quantized charge pumping. The quantum phase transition between this mixed triplet $d$-density wave and skyrmionic superconducting condensate likely leads to… 
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