Singlet and triplet Cooper pair splitting in hybrid superconducting nanowires.
Singlet and triplet Cooper pair splitting in hybrid superconducting nanowires.
复制标题
混合超导纳米线中的单线态和三线态库珀对分裂。
作者：
Guanzhong Wang;T. Dvir;G. P. Mazur;Chun;N. van Loo;S. L. ten Haaf;A. Bordin;S. Gazibegović;G. Badawy;E. Bakkers;M. Wimmer;L. Kouwenhoven
在大多数天然存在的超导体中，具有相反自旋的电子形成库珀对。这既包括像铝这样的常规s波超导体，也包括高转变温度的d波超导体。具有本征p波超导性、由等自旋电子组成库珀对的材料，尽管有一些有希望的进展，但尚未被确凿地鉴定出来，也没有被合成出来。相反，将s波超导体与磁性材料接触的工程平台已经显示出等自旋配对的令人信服的特征。在这里，我们直接测量了自旋极化量子点之间的等自旋配对。这种配对是从s波超导体通过近邻效应诱导到具有强自旋 - 轨道相互作用的半导体纳米线中的。我们通过表明打破一个库珀对可以产生两个具有相同自旋极化的电子来证明这种配对。我们的结果展示了对量子点之间单态和三重态配对的可控探测。要实现一个人工基塔耶夫链，需要在一系列量子点中实现这种三重态配对。
In most naturally occurring superconductors, electrons with opposite spins form Cooper pairs. This includes both conventional s-wave superconductors such as aluminium, as well as high-transition-temperature, d-wave superconductors. Materials with intrinsic p-wave superconductivity, hosting Cooper pairs made of equal-spin electrons, have not been conclusively identified, nor synthesized, despite promising progress1-3. Instead, engineered platforms where s-wave superconductors are brought into contact with magnetic materials have shown convincing signatures of equal-spin pairing4-6. Here we directly measure equal-spin pairing between spin-polarized quantum dots. This pairing is proximity-induced from an s-wave superconductor into a semiconducting nanowire with strong spin-orbit interaction. We demonstrate such pairing by showing that breaking a Cooper pair can result in two electrons with equal spin polarization. Our results demonstrate controllable detection of singlet and triplet pairing between the quantum dots. Achieving such triplet pairing in a sequence of quantum dots will be required for realizing an artificial Kitaev chain7-9.
影响因子：
8.6
作者：
Herrmann, L. G.;Portier, F.;Strunk, C.
通讯作者：
Strunk, C.