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arXiv 2107.08282cond-mat.mes-hall
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四端薄InAs-Al纳米线器件中的大零偏置峰和谷

Large zero bias peaks and dips in a four-terminal thin InAs-Al nanowire device

Huading Song, Zitong Zhang, Dong Pan, Donghao Liu, Zhaoyu Wang, Zhan Cao, Lei Liu, Lianjun Wen, Dunyuan Liao, Ran Zhuo, Dong E Liu, Runan Shang, Jianhua Zhao, Hao Zhang

摘要:

我们报道了一种四端设计的InAs-Al混合超导体-超导体纳米线器件的电子输运研究。与以前的工作相比,更薄的InAs纳米线(直径小于40 nm),预计将达到更少的子带制度。四端器件设计不包括电极接触电阻,这是一个未知值,不可避免地影响以前报道的器件电导。使用隧道光谱,我们发现大的零偏置峰(ZBP)的微分电导的顺序为$2e^2/h$。通过扫描不同的栅极电压和磁场来研究ZBP的演变,我们发现零偏置峰和零偏置谷之间的转变,而零偏置电导接近$2e^2/h$。我们讨论了一个拓扑平凡的解释,涉及无序,光滑的潜在变化和准马约拉纳零模式。

英文摘要:

We report electron transport studies of a thin InAs-Al hybrid semiconductor-superconductor nanowire device using a four-terminal design. Compared to previous works, thinner InAs nanowire (diameter less than 40 nm) is expected to reach fewer sub-band regime. The four-terminal device design excludes electrode contact resistance, an unknown value which has inevitably affected previously reported device conductance. Using tunneling spectroscopy, we find large zero-bias peaks (ZBPs) in differential conductance on the order of $2e^2/h$. Investigating the ZBP evolution by sweeping various gate voltages and magnetic field, we find a transition between a zero-bias peak and a zero-bias dip while the zero-bias conductance sticks close to $2e^2/h$. We discuss a topologically trivial interpretation involving disorder, smooth potential variation and quasi-Majorana zero modes.

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