Andreev reflection from noncentrosymmetric superconductors and Majorana bound-state generation in half-metallic ferromagnets
Andreev reflection from noncentrosymmetric superconductors and Majorana bound-state generation in half-metallic ferromagnets
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DOI：
10.1103/physrevb.83.054513
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发表时间：
2011-02-23
影响因子：
3.7
通讯作者：
Brouwer, Piet W.
中科院分区：
文献类型：
--
作者：
Duckheim, Mathias;Brouwer, Piet W.
我们研究了具有自旋轨道相互作用的半金属和超导体之间界面的安德烈夫反射。虽然半金属中缺乏少数载流子使得单重态安德烈夫反射不可能，但自旋轨道相互作用会引起三重态安德烈夫反射（即，多数电子反射到多数空穴中，反之亦然）。作为我们计算的应用，我们考虑横向连接到超导接触的半金属薄膜或导线。如果半金属是无序的，则会打开一个与超导体中自旋轨道相互作用强度成正比的激发间隙。对于能量低于该间隙的电子，横向半金属超导体接触变成完美的三线态安德烈夫反射器。我们证明系统在此限制下支持本地化的马约拉纳最终状态。
We study Andreev reflection at an interface between a half metal and a superconductor with spin-orbit interaction. While the absence of minority carriers in the half metal makes singlet Andreev reflection impossible, the spin-orbit interaction gives rise to triplet Andreev reflection (i.e., the reflection of a majority electron into a majority hole or vice versa). As an application of our calculation, we consider a thin half-metal film or wire laterally attached to a superconducting contact. If the half metal is disorder free, an excitation gap is opened that is proportional to the spin-orbit interaction strength in the superconductor. For electrons with energy below this gap a lateral half-metal-superconductor contact becomes a perfect triplet Andreev reflector. We show that the system supports localized Majorana end states in this limit.