arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.10623cond-mat.mes-hallcond-mat.supr-conquant-ph
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具有隐藏Dirac点的拓扑绝缘体中的Majorana束缚态

Majorana bound states in topological insulators with hidden Dirac points

Ferdinand Schulz, Kirill Plekhanov, Daniel Loss, Jelena Klinovaja

摘要:

我们解决的问题,是否有可能产生马约拉纳束缚态的磁超导界面在二维拓扑绝缘体与隐藏的狄拉克点的频谱。在这种情况下,边缘态的狄拉克点位于体态的能量处,使得两种类型的态强烈杂化。在这里,我们表明,定义良好的马约拉纳束缚态,可以得到即使在材料中隐藏的狄拉克点提供的磁条的宽度被选择为与边缘状态的本地化长度相媲美。所得到的拓扑相图允许人们精确地提取狄拉克点在光谱中的位置。除了标准的零偏置峰的特点所造成的马约拉纳束缚态在运输实验中,我们建议补充未来的实验与测量的电荷和自旋极化。特别是,我们证明了这两个可观的翻转他们的符号在拓扑相变,因此,提供了一个独立的签名的拓扑超导性的存在。所有特征在基本上强的无序中保持稳定。

英文摘要:

We address the issue whether it is possible to generate Majorana bound states at the magnetic-superconducting interface in two-dimensional topological insulators with hidden Dirac points in the spectrum. In this case, the Dirac point of edge states is located at the energies of the bulk states such that two types of states are strongly hybridized. Here, we show that well-defined Majorana bound states can be obtained even in materials with hidden Dirac point provided that the width of the magnetic strip is chosen to be comparable with the localization length of the edge states. The obtained topological phase diagram allows one to extract precisely the position of the Dirac point in the spectrum. In addition to standard zero-bias peak features caused by Majorana bound states in transport experiments, we propose to supplement future experiments with measurements of charge and spin polarization. In particular, we demonstrate that both observables flip their signs at the topological phase transition, thus, providing an independent signature of the presence of topological superconductivity. All features remain stable against substantially strong disorder.

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