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arXiv 2103.06722cond-mat.mes-hall
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量子霍尔石墨烯的Andreev反射机制

Mechanisms of Andreev reflection in quantum Hall graphene

Antonio L. R. Manesco, Ian Matthias Flór, Chun-Xiao Liu, Anton R. Akhmerov

摘要:

我们在量子霍尔机制中模拟了混合超导体-石墨烯器件,以在最近的实验中识别下游电阻振荡的起源[Zhao et. Nature Physics 16,(2020)]。除了之前研究的谷极化边缘态之间的马赫-曾德尔干涉之外,我们还考虑了无序诱导的散射,以及之前忽视的由界面密度失配产生的反向传播态的出现。比较我们的结果与实验,我们得出结论,所观察到的振荡引起的界面无序,晶格匹配的超导体是必要的,以观察替代弹道效应。

英文摘要:

We simulate a hybrid superconductor-graphene device in the quantum Hall regime to identify the origin of downstream resistance oscillations in a recent experiment [Zhao et. al. Nature Physics 16, (2020)]. In addition to the previously studied Mach-Zehnder interference between the valley-polarized edge states, we consider disorder-induced scattering, and the previously overlooked appearance of the counter-propagating states generated by the interface density mismatch. Comparing our results with the experiment, we conclude that the observed oscillations are induced by the interfacial disorder, and that lattice-matched superconductors are necessary to observe the alternative ballistic effects.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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