Observability of surface Andreev bound states in a topological insulator in proximity to an s-wave superconductor
Observability of surface Andreev bound states in a topological insulator in proximity to an s-wave superconductor
复制标题
靠近 s 波超导体的拓扑绝缘体中表面安德烈夫束缚态的可观测性
DOI：
10.1088/0953-8984/27/31/315701
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
A .Brinkman
中科院分区：
文献类型：
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作者：
M. Snelder;A. A. Golubov;Y. Asano;A .Brinkman
为了指导寻找马约拉纳零能量模式的实验工作，我们计算了三维拓扑绝缘体与s波超导体相结合的超导配对对称性。我们展示了如何在不同的拓扑制度的配对对称性的变化。我们证明，占主导地位的p波配对关系是不足以实现一个马约拉纳零能量模式的量子计算有用的。我们的主要结果是奇频率配对和马约拉纳零能量模式之间的关系，通过使用绿色函数技术在三维拓扑绝缘体在所谓的马约拉纳制度。此后，我们将讨论如何在不同的制度中的配对关系可以观察到的s波近似的三维拓扑绝缘体的隧穿电导。我们讨论了引入铁磁绝缘体以将零能束缚态作为马约拉纳模式定位到界面的必要性。
To guide experimental work on the search for Majorana zero-energy modes, we calculate the superconducting pairing symmetry of a three-dimensional topological insulator in combination with an s-wave superconductor. We show how the pairing symmetry changes across different topological regimes. We demonstrate that a dominant p-wave pairing relation is not sufficient to realise a Majorana zero-energy mode useful for quantum computation. Our main result is the relation between odd-frequency pairing and Majorana zero energy modes by using Green functions techniques in three-dimensional topological insulators in the so-called Majorana regime. We discuss thereafter how the pairing relations in the different regimes can be observed in the tunneling conductance of an s-wave proximised three-dimensional topological insulator. We discuss the necessity to incorporate a ferromagnetic insulator to localise the zero-energy bound state to the interface as a Majorana mode.