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arXiv 1106.3605cond-mat.mes-hall
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超导邻近效应的观测和候选拓扑绝缘体中珍珠涡旋的可能证据

Observation of the superconducting proximity effect and possible evidence for Pearl vortices in a candidate topological insulator

Duming Zhang, Jian Wang, Ashley M. DaSilva, Joon Sue Lee, Humberto R. Gutierrez, Moses H. W. Chan, Jainendra Jain, Nitin Samarth

摘要:

我们报道了超导邻近效应的观察在纳米带的候选拓扑绝缘体(Bi 2 Se 3),这是与超导(钨)接触接口。我们观察到一个超导和多个Andreev反射的通道长度比推导出正常状态运输的非弹性和扩散的热长度长得多。这表明邻近效应优先耦合到弹道表面传输通道,即使在共存的扩散体通道的存在下。当一个磁场垂直于纳米晶的平面施加时,我们观察到在磁场中周期性的磁阻振荡。定量比较与模型的涡旋封锁有关的珍珠涡的形成在该地区的邻近诱导超导性的发生这些振荡。

英文摘要:

We report the observation of the superconducting proximity effect in nanoribbons of a candidate topological insulator (Bi2Se3) which is interfaced with superconducting (tungsten) contacts. We observe a supercurrent and multiple Andreev reflections for channel lengths that are much longer than the inelastic and diffusive thermal lengths deduced from normal state transport. This suggests that the proximity effect couples preferentially to a ballistic surface transport channel, even in the presence of a coexisting diffusive bulk channel. When a magnetic field is applied perpendicular to the plane of the nanoribbon, we observe magnetoresistance oscillations that are periodic in magnetic field. Quantitative comparison with a model of vortex blockade relates the occurrence of these oscillations to the formation of Pearl vortices in the region of proximity induced superconductivity.

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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