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Superconductivity from fractionalized excitations in URu_2Si_2

机译:URu_2Si_2中分数激发的超导性

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摘要

An unconventional pairing mechanism in the heavy-fermion material URu_2Si_2 is studied. We propose a mixed singlet-triplet d-density wave to be the hidden-order state in URu_2Si_2. The exotic order is topologically nontrivial and supports a charge 2e skyrmionic spin texture, which is assumed to fractionalize into merons and antimerons at the deconfined quantum critical point. The interaction between these fractional particles results in a (pseudo)spin-singlet chiral d-wave superconducting state, which breaks time-reversal symmetry. Therefore, it is highly likely to produce a nonzero signal of the polar Kerr effect at the onset of the superconductivity, consistent with recent experiments. In addition, the nodal structures of the possible pairing functions in our model are consistent with the thermodynamic experiments in URu_2Si_2.
机译:研究了重费米材料URu_2Si_2中的非常规配对机理。我们提出混合单重态-三重态d密度波为URu_2Si_2中的隐伏状态。奇异阶在拓扑上是不平凡的,并且支持带电2e天体离子自旋纹理,假定在限定的量子临界点上将其分成瓜子和反瓜子。这些分数粒子之间的相互作用导致(伪)自旋单手性d波超导状态,这打破了时间反转对称性。因此,极有可能在超导开始时产生极性克尔效应的非零信号,这与最近的实验一致。此外,我们模型中可能的配对函数的节点结构与URu_2Si_2中的热力学实验一致。

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