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Identifying the topological superconducting phase in a multiband quantum wire

机译:识别多带量子线中的拓扑超导相

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Distinguishing the zero-bias peak (ZBP) caused by Majorana fermions from that caused by other effects remains a challenge in detecting the topological superconducting phase in a quantum wire. In this paper, we show that one can distinguish Majorana fermions from the trivial zero-energy Andreev bound states caused by impurities in the material by making a Josephson junction of the quantum wire attached to a side lead and then measuring the tunneling conductance through it as the phase difference across the junction Φ varies. We calculate the tunneling conductance in the presence of an additional zero-energy impurity level at the Josephson junction. Even if the ZBPs exist in both the topological and trivial phases, we can identify the topological superconducting phase by a conductance peak at Φ = n and a nearby butterfly pattern.
机译:在检测量子线中的拓扑超导相时,将马约拉那费米子引起的零偏峰(ZBP)与其他效应引起的零偏峰区分开来仍然是一个挑战。在本文中,我们表明可以通过使附着在侧引线上的量子线的约瑟夫森结,然后测量通过它的隧穿电导来区分马来那费马子与材料中杂质引起的零级零能安德列夫键态。结Φ的相位差会变化。我们在约瑟夫森结处存在附加零能量杂质能级的情况下计算隧道电导。即使ZBPs既存在于拓扑阶段,也存在于琐碎阶段,我们也可以通过Φ= n处的电导峰和附近的蝴蝶图案来识别拓扑超导阶段。

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