Tunable Rashba Spin-Orbit Interaction at Oxide Interfaces
Tunable Rashba Spin-Orbit Interaction at Oxide Interfaces
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DOI：
10.1103/physrevlett.104.126803
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发表时间：
2010-03-26
影响因子：
8.6
通讯作者：
Triscone, J. -M.
中科院分区：
文献类型：
--
作者：
Caviglia, A. D.;Gabay, M.;Triscone, J. -M.
在LaAlO（3）/SrTiO（3）界面发现的准二维电子气提供了令人兴奋的新功能，例如可调超导性，并已被提议作为新的纳米电子制造平台。在这里，我们列出了一个新的例子所产生的电子性质的界面破缺的反转对称性，即一个大的Rashba自旋轨道相互作用，其幅度可以调制的应用程序的外部电场。通过磁输运实验，我们探索了系统的自旋轨道耦合的演化。我们发现了一个陡峭的上升Rashba相互作用发生在掺杂水平附近的量子临界点分离的绝缘和超导基态的系统。
The quasi-two-dimensional electron gas found at the LaAlO(3)/SrTiO(3) interface offers exciting new functionalities, such as tunable superconductivity, and has been proposed as a new nanoelectronics fabrication platform. Here we lay out a new example of an electronic property arising from the interfacial breaking of inversion symmetry, namely, a large Rashba spin-orbit interaction, whose magnitude can be modulated by the application of an external electric field. By means of magnetotransport experiments we explore the evolution of the spin-orbit coupling across the phase diagram of the system. We uncover a steep rise in Rashba interaction occurring around the doping level where a quantum critical point separates the insulating and superconducting ground states of the system.