Majorana bound states in nanowire-superconductor hybrid systems in periodic magnetic fields
Majorana bound states in nanowire-superconductor hybrid systems in periodic magnetic fields
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DOI：
10.1103/physrevb.101.125414
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发表时间：
2019-11
影响因子：
3.7
通讯作者：
V. Kornich;M. Vavilov;M. Friesen;M. Eriksson;S. Coppersmith
中科院分区：
文献类型：
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作者：
V. Kornich;M. Vavilov;M. Friesen;M. Eriksson;S. Coppersmith
我们研究周期性磁场的形状如何影响纳米线-超导体系统中马约拉纳束缚态（MBS）的存在。受纳米磁体阵列可以产生的场配置的启发，我们考虑具有椭圆形横截面的螺旋场和具有两个正弦分量的场。我们证明 MBS 对于不完美的螺旋磁场具有鲁棒性。特别是，如果将一个分量的幅度调整为由导线中的超导序参数确定的值，则即使第二分量具有小得多的幅度，MBS也可以存在。我们还探讨了化学势对相图的影响。我们的分析包括数值分析和解析分析，两种方法之间具有良好的一致性。
We study how the shape of a periodic magnetic field affects the presence of Majorana bound states (MBS) in a nanowire-superconductor system. Motivated by the field configurations that can be produced by an array of nanomagnets, we consider spiral fields with an elliptic cross section and fields with two sinusoidal components. We show that MBS are robust to imperfect helical magnetic fields. In particular, if the amplitude of one component is tuned to the value determined by the superconducting order parameter in the wire, the MBS can exist even if the second component has a much smaller amplitude. We also explore the effect of the chemical potential on the phase diagram. Our analysis is both numerical and analytical, with good agreement between the two methods.