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Superconducting proximity effect and possible evidence for Pearl vortices in a candidate topological insulator

机译:候选拓扑绝缘体中珍珠涡旋的超导邻近效应及可能证据

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摘要

We report the observation of the superconducting proximity effect in nanoribbons of a candidate topological insulator (Bi_2Se_3), 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.
机译:我们报告了在候选拓扑绝缘体(Bi_2Se_3)的纳米带中的超导邻近效应的观察,该拓扑绝缘体与超导(钨)接触件相接。我们观察到一个超电流反射和多次安德列夫反射,其通道长度比正常状态传输所推导的非弹性和扩散热长度长得多。这表明即使在存在共存的扩散体通道的情况下,邻近效应也优先与弹道表面传输通道耦合。当垂直于纳米带的平面施加磁场时,我们观察到在磁场中呈周期性的磁阻振荡。与涡旋阻塞模型的定量比较将这些振荡的发生与邻近感应超导区域中珍珠涡的形成联系起来。

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  • 来源
    《Physical review》 |2011年第16期|p.165120.1-165120.8|共8页
  • 作者单位

    The Center for Nanoscale Science and Department of Physics, The Pennsylvania State University, University Park,Pennsylvania 16802-6300, USA;

    The Center for Nanoscale Science and Department of Physics, The Pennsylvania State University, University Park,Pennsylvania 16802-6300, USA;

    The Center for Nanoscale Science and Department of Physics, The Pennsylvania State University, University Park,Pennsylvania 16802-6300, USA;

    The Center for Nanoscale Science and Department of Physics, The Pennsylvania State University, University Park,Pennsylvania 16802-6300, USA;

    The Center for Nanoscale Science and Department of Physics, The Pennsylvania State University, University Park,Pennsylvania 16802-6300, USA;

    The Center for Nanoscale Science and Department of Physics, The Pennsylvania State University, University Park,Pennsylvania 16802-6300, USA;

    The Center for Nanoscale Science and Department of Physics, The Pennsylvania State University, University Park,Pennsylvania 16802-6300, USA;

    The Center for Nanoscale Science and Department of Physics, The Pennsylvania State University, University Park,Pennsylvania 16802-6300, USA;

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  • 正文语种 eng
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  • 关键词

    surface conductivity and carrier phenomena; phases: geometric; dynamic or topological; spin-orbit coupling, zeeman and stark splitting, jahn-teller effect; localization effects (anderson or weak localization);

    机译:表面电导率和载流子现象;相:几何;动态或拓扑;自旋轨道耦合;塞曼和斯塔克分裂;詹恩-泰勒效应;局域效应(安德森或弱局域);

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