Manipulation of the Majorana Fermion, Andreev Reflection, and Josephson Current on Topological Insulators
Manipulation of the Majorana Fermion, Andreev Reflection, and Josephson Current on Topological Insulators
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DOI：
10.1103/physrevlett.103.107002
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发表时间：
2009-09-04
影响因子：
8.6
通讯作者：
Nagaosa, Naoto
中科院分区：
文献类型：
--
作者：
Tanaka, Yukio;Yokoyama, Takehito;Nagaosa, Naoto
我们从理论上研究了在三维拓扑绝缘体表面形成的普通金属（N）/铁磁绝缘体（FI）/超导体（S）结和S/FI/S结的输运特性，其中FI/S界面处存在手性马约拉纳模式。我们发现 N/FI/S 和 S/FI/S 结中产生的手性马约拉纳模式受到 FI 区域磁化强度 m 方向的非常敏感的控制。特别是，S/FI/S 结中约瑟夫森电流的电流相位关系既不具有 0 也不具有 pi 的相移，可以通过垂直于界面的 m 分量连续调节。
We study theoretically the transport properties of a normal metal (N)/ferromagnet insulator (FI)/superconductor (S) junction and a S/FI/S junction formed on the surface of a three-dimensional topological insulator, where the chiral Majorana mode exists at the FI/S interface. We find the chiral Majorana mode generated in N/FI/S and S/FI/S junctions is very sensitively controlled by the direction of the magnetization m in the FI region. In particular, the current-phase relation of the Josephson current in S/FI/S junctions has a phase shift of neither 0 nor pi that can be tuned continuously by the component of m perpendicular to the interface.