Superconductivity in a chiral nanotube.
Superconductivity in a chiral nanotube.
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DOI：
10.1038/ncomms14465
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发表时间：
2017-02-16
影响因子：
16.6
通讯作者：
Iwasa Y
中科院分区：
文献类型：
--
作者：
Qin F;Shi W;Ideue T;Yoshida M;Zak A;Tenne R;Kikitsu T;Inoue D;Hashizume D;Iwasa Y
材料的手性会影响其光学、磁学和电学性质，从而导致许多非平凡的现象，如手性分子的圆二色性、手性磁体中的磁性Skyrmions和手性导体中的非互易载流子输运。另一方面，手征性对超导输运的影响还不清楚。在这里，我们报告的非互易性的超导性-明确的证据，超导性反映手征结构，其中的向前和向后的超导电流是不等价的，因为反演对称性破缺。这种超导电性是通过单个二硫化钨手性纳米管中的离子门控实现的。在超导状态下，非互易信号显著增强，这与源于超导电流沿着纳米管圆周的干扰的前所未有的量子Little-Parks振荡有关。结果表明，非互易性是研究手征或非中心对称结构超导体的一种可行的方法。手征性影响材料的许多性质，但它如何影响超导性仍不清楚。在这里，Qin等人报告了WS 2通过离子门控在单个纳米管中的非互易超电流流动，证明了手性超导传输。
Chirality of materials are known to affect optical, magnetic and electric properties, causing a variety of nontrivial phenomena such as circular dichiroism for chiral molecules, magnetic Skyrmions in chiral magnets and nonreciprocal carrier transport in chiral conductors. On the other hand, effect of chirality on superconducting transport has not been known. Here we report the nonreciprocity of superconductivity—unambiguous evidence of superconductivity reflecting chiral structure in which the forward and backward supercurrent flows are not equivalent because of inversion symmetry breaking. Such superconductivity is realized via ionic gating in individual chiral nanotubes of tungsten disulfide. The nonreciprocal signal is significantly enhanced in the superconducting state, being associated with unprecedented quantum Little-Parks oscillations originating from the interference of supercurrent along the circumference of the nanotube. The present results indicate that the nonreciprocity is a viable approach toward the superconductors with chiral or noncentrosymmetric structures. Chirality affects many properties of materials, but how it affects superconductivity remains unclear. Here, Qin et al. report nonreciprocal supercurrent flows in individual nanotubes of WS2 via ionic gating, evidencing chiral superconducting transport.