Signatures of Rashba spin-orbit interaction in the superconducting proximity effect in helical Luttinger liquids
Signatures of Rashba spin-orbit interaction in the superconducting proximity effect in helical Luttinger liquids
复制标题
螺旋路廷格液体超导邻近效应中 Rashba 自旋轨道相互作用的特征
DOI：
10.1103/physrevb.85.035310
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发表时间：
2012
影响因子：
3.7
通讯作者：
P. Recher
中科院分区：
文献类型：
--
作者：
P. Virtanen;P. Recher
我们考虑了二维拓扑绝缘体边缘螺旋Luttinger液体中的超导邻近效应，推导了边缘态隧道耦合到安波超导体的低能Hamilton量。除了左右移动模式之间的相关性之外，耦合可以在单个模式内诱导它们，因为边缘模式的自旋轴不一定是恒定的。这可以通过Rashba自旋轨道耦合在HgTe/CdTe量子阱中可控地诱导，并且是边缘状态波函数的2D性质的结果。威尔斯。在邻近效应中这两个特征的区别对于使用这种螺旋模式以分裂库珀对也是至关重要的。我们讨论了随之而来的运输签名，并指出了一个长期的功能，在直流电导测量，可用于区分两种类型的相关性存在，并确定Rashba相互作用的大小。
We consider the superconducting proximity effect in a helical Luttinger liquid at the edge of a two-dimensional (2D) topological insulator, and derive the low-energy Hamiltonian for an edge state tunnel-coupled to an-wave superconductor. In addition to correlations between the left- and right-moving modes, the coupling can induce them inside a single mode, as the spin axis of the edge modes is not necessarily constant. This can be induced controllably in HgTe/CdTe quantum wells via the Rashba spin-orbit coupling, and is a consequence of the 2D nature of the edge-state wave function. The distinction of these two features in the proximity effect is also vital for the use of such helical modes in order to split Cooper pairs. We discuss the consequent transport signatures, and point out a long-ranged feature in a dc conductance measurement that can be used to distinguish the two types of correlations present and to determine the magnitude of the Rashba interaction.