Anomalous normal fluid response in a chiral superconductor UTe(2).
Anomalous normal fluid response in a chiral superconductor UTe(2).
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DOI：
10.1038/s41467-021-22906-6
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发表时间：
2021-05-11
影响因子：
16.6
通讯作者：
Anlage SM
中科院分区：
文献类型：
--
作者：
Bae S;Kim H;Eo YS;Ran S;Liu IL;Fuhrman WT;Paglione J;Butch NP;Anlage SM
手性超导体已被认为是在其边界实现Majorana正常流体的一种途径。然而，人们长期寻找的具有边缘和表面Majorana正态流体的2D和3D手性超导体尚未被最终发现。在这里，我们报告了UTe2具有表面正常流体响应的手性自旋-三重态配对状态的证据。测量了UTe2晶体的微波表面阻抗，并将其转换为对正常和超流响应都敏感的复电性。异常的剩余正常流体电导率支持存在显著的正常流体响应。超流电导率遵循预测的同轴自旋三重态的温度行为，进一步缩小到手性自旋三重态，有证据表明时间反转对称性被打破。进一步分析排除了观察到的正常流体反应的微不足道的来源。我们的研究结果表明，UTe2可以成为研究高维奇异拓扑激发的新平台。手性超导体有望在其边界实现马约拉纳正常流体，但在实验上仍难以捉摸。在这里，Bae等人。报道了UTe2单晶中异常的表面正常流体响应，并进一步将其归因于手性自旋-三重态对状态。
Chiral superconductors have been proposed as one pathway to realize Majorana normal fluid at its boundary. However, the long-sought 2D and 3D chiral superconductors with edge and surface Majorana normal fluid are yet to be conclusively found. Here, we report evidence for a chiral spin-triplet pairing state of UTe2 with surface normal fluid response. The microwave surface impedance of the UTe2 crystal was measured and converted to complex conductivity, which is sensitive to both normal and superfluid responses. The anomalous residual normal fluid conductivity supports the presence of a significant normal fluid response. The superfluid conductivity follows the temperature behavior predicted for an axial spin-triplet state, which is further narrowed down to a chiral spin-triplet state with evidence of broken time-reversal symmetry. Further analysis excludes trivial origins for the observed normal fluid response. Our findings suggest that UTe2 can be a new platform to study exotic topological excitations in higher dimension. Chiral superconductors are predicted to realize Majorana normal fluid at its boundary, but remain elusive experimentally. Here, Bae et al. report anomalous surface normal fluid response in UTe2 single crystal which is further attributed to a chiral spin-triplet pairing state.
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