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Charge-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>2</mml:mn><mml:mi>e</mml:mi></mml:mrow></mml:math>skyrmion condensate in a hidden-order state
A higher-angular-momentum ($\ensuremath{\ell}=2$) $d$ 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 …