arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1812.08090cond-mat.supr-con
收藏

界面自旋轨道耦合:超导自旋电子学的新平台

Interfacial Spin-Orbit Coupling: New Platform for Superconducting Spintronics

Isidoro Martínez, Petra Högl, César González-Ruano, Juan Pedro Cascales, Coriolan Tiusan, Yuan Lu, Michel Hehn, Alex Matos-Abiague, Jaroslav Fabian, Igor Žutić, Farkhad G. Aliev

摘要:

自旋轨道耦合(SOC)是自旋电子学中的一个关键相互作用,允许对自旋或磁化进行电控制,反之亦然,对电流进行磁控制。然而,最近的进展揭示了SOC的更广泛的含义,它也是拓扑态设计的核心,包括拓扑绝缘体,skyrmion和Majorana费米子,或者克服Mermin-Wagner定理预期的二维铁磁性的排除。SOC和由此产生的新兴的界面自旋轨道场简单地实现在结通过结构反转不对称性,而在磁阻(MR)的各向异性允许它们的实验检测。令人惊讶的是,我们证明,只有一个可以忽略的MR各向异性的全外延铁磁体/MgO/金属结进行了显着的转变低于超导转变温度的金属。超导结具有高三个数量级的MR各向异性,并支持形成自旋三重态超导性,这对超导自旋电子学和拓扑保护的量子计算至关重要。我们的研究结果呼吁重新审视SOC在其他系统中的作用,即使在正常状态下似乎可以忽略不计,也可能对超导响应产生深远的影响。

英文摘要:

Spin-orbit coupling (SOC) is a key interaction in spintronics, allowing an electrical control of spin or magnetization and, vice versa, a magnetic control of electrical current. However, recent advances have revealed much broader implications of SOC that is also central to the design of topological states, including topological insulators, skyrmions, and Majorana fermions, or to overcome the exclusion of two-dimensional ferro-magnetism expected from the Mermin-Wagner theorem. SOC and the resulting emergent interfacial spin-orbit fields are simply realized in junctions through structural inversion asymmetry, while the anisotropy in magnetoresistance (MR) allows for their experimental detection. Surprisingly, we demonstrate that an all-epitaxial ferromagnet/MgO/metal junction with only a negligible MR anisotropy undergoes a remarkable transformation below the superconducting transition temperature of the metal. The superconducting junction has a three orders of magnitude higher MR anisotropy and supports the formation of spin-triplet superconductivity, crucial for superconducting spintronics, and topologically-protected quantum computing. Our findings call for revisiting the role of SOC in other systems which, even when it seems negligible in the normal state, could have a profound influence on the superconducting response.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑