Uniaxial-strain control of nematic superconductivity in SrxBi2Se3
Uniaxial-strain control of nematic superconductivity in SrxBi2Se3
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DOI：
10.1038/s41467-020-17913-y
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发表时间：
2019-10
影响因子：
16.6
通讯作者：
I. Kostylev;S. Yonezawa;Zhiwei Wang;Y. Ando;Y. Maeno
中科院分区：
文献类型：
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作者：
I. Kostylev;S. Yonezawa;Zhiwei Wang;Y. Ando;Y. Maeno
向列态的特征是没有平移有序的旋转对称性破缺。最近，人们发现了向列相超导，它的超导带隙自发地提升了晶格的旋转对称性。在向列相超导中，可以存在多个具有不同向列相取向的超导磁区，这些磁区可以被共轭的外部刺激所控制。磁体中的磁畴工程很常见，但在超导体中还没有实现。在这里，我们报道了通过外加单轴应力来控制SrxBi2Se_3的向列相超导电性及其电畴。亚区的抑制表明，在沿基本的BiBi键压缩的情况下，最有利于Δ的4y态。这一事实使我们能够确定向列性和晶格扭曲之间的耦合参数。这些结果为微观理解和未来利用独特的拓扑向列超导电性提供了必然的一步。
Nematic states are characterized by rotational symmetry breaking without translational ordering. Recently, nematic superconductivity, in which the superconducting gap spontaneously lifts the rotational symmetry of the lattice, has been discovered. In nematic superconductivity, multiple superconducting domains with different nematic orientations can exist, and these domains can be controlled by a conjugate external stimulus. Domain engineering is quite common in magnets but has not been achieved in superconductors. Here, we report control of the nematic superconductivity and their domains of SrxBi2Se3, through externally-applied uniaxial stress. The suppression of subdomains indicates that it is the Δ4ystate that is most favoured under compression along the basal Bi-Bi bonds. This fact allows us to determine the coupling parameter between the nematicity and lattice distortion. These results provide an inevitable step towards microscopic understanding and future utilization of the unique topological nematic superconductivity.