Magneto-Josephson effects in junctions with Majorana bound states
Magneto-Josephson effects in junctions with Majorana bound states
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DOI：
10.1103/physrevb.87.075438
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发表时间：
2012-06
影响因子：
3.7
通讯作者：
Liang Jiang;D. Pekker;J. Alicea;G. Refael;Y. Oreg;A. Brataas;F. Oppen
中科院分区：
文献类型：
--
作者：
Liang Jiang;D. Pekker;J. Alicea;G. Refael;Y. Oreg;A. Brataas;F. Oppen
我们研究一维量子系统，支持马约拉纳束缚态在拓扑不同的区域之间的接口。特别是，我们发现，在某些自旋-轨道耦合的一维平台，如拓扑绝缘体边缘的粒子-空穴和自旋自由度之间存在着一种对偶性。这种二元性导致了之前探索的“分数约瑟夫森效应”的自旋模拟，即流过磁性结的自旋电流在整个结的相对磁场角中表现出4π的周期性。此外，粒子-空穴自由度和自旋自由度之间的相互作用导致非常规的磁约瑟夫森效应，使得约瑟夫森电荷电流是具有周期性4π的磁场取向的函数。
We investigate 1D quantum systems that support Majorana bound states at interfaces between topologically distinct regions. In particular, we show that there exists a duality between particle-hole and spin degrees of freedom in certain spin-orbit-coupled 1D platforms such as topological insulator edges. This duality results in a spin analog of previously explored "fractional Josephson effects"—that is, the spin current flowing across a magnetic junction exhibits 4π periodicity in the relative magnetic field angle across the junction. Furthermore, the interplay between the particle-hole and spin degrees of freedom results in unconventional magneto-Josephson effects, such that the Josephson charge current is a function of the magnetic field orientation with periodicity 4π.