论文标题
拓扑长度对拓扑纳米线中结合状态特征的影响
Effect of topological length on Bound states signatures in a Topological nanowire
论文作者
论文摘要
在纳米线结束时，Majorana Bound Bound State（MBS）已被提议为拓扑Qubt的最重要的候选者之一。然而，在半导体 - 驱动器异质结构中MBS存在的验证中，MB和Andreev结合状态（ABS）的类似隧道电导特征已成为MBS存在的主要障碍。在本文中，我们使用协议来探测MBS特定的特性，并使用它来区分拓扑零偏置峰（ZBP）与微不足道的质量。对于涉及纳米线量化ZBP的场景，我们提出了一种方案，其中改变了线中拓扑区域的长度。然后，可以利用隧道电导标志来衡量对低能状态能量的影响。我们表明，拓扑和琐碎的ZBP在我们的方案下的行为不同，尤其是在整个方案中，拓扑ZBP在零偏置方面保持稳健，而琐碎的ZBP在有限偏见的情况下分为两个峰。该协议由于其可分离性而探测了接近零能状态的保护，从而使我们能够区分拓扑和琐碎的ZBP。
Majorana bound states (MBS) at the end of nanowires have been proposed as one of the most important candidate for the topological qubits. However, similar tunneling conductance features for both the MBS and Andreev bound states (ABS) have turned out to be a major obstacle in the verification of the presence of MBS in semiconductor-superconductor heterostructures. In this article, we use a protocol to probe properties specific to the MBS and use it to distinguish the topological zero-bias peak (ZBP) from a trivial one. For a scenario involving quantized ZBP in the nanowire, we propose a scheme wherein the length of the topological region in the wire is altered. The tunneling conductance signatures can then be utilized to gauge the impact on the energy of the low-energy states. We show that the topological and trivial ZBP behave differently under our protocol, in particular, the topological ZBP remains robust at zero bias throughout the protocol, while the trivial ZBP splits into two peaks at finite bias. This protocol probes the protection of near zero energy states due to their separable nature, allowing us to distinguish between topological and trivial ZBP.
