超导体近似化拓扑绝缘体纳米线中的远距离交叉Andreev反射

IF 17.6 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY
Junya Feng, Henry F. Legg, Mahasweta Bagchi, Daniel Loss, Jelena Klinovaja, Yoichi Ando
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引用次数: 0

摘要

交叉安德烈夫反射是一种非局域输运现象,它在遥远的位置之间产生并探测库珀对相关性。这也是产生远程纠缠的库珀对分裂的基础。虽然交叉安德烈夫反射已经被广泛地研究在半导体接近耦合的超导体,观察它在拓扑绝缘体是非常困难的。在这里,我们报告了在近似拓扑绝缘体纳米线中观察到的这种效应。我们对介观器件进行了局部和非局部电导光谱分析,其中超导铌和金属触点连接到体绝缘纳米线上。在我们的局部电导测量中,我们检测到一个硬间隙和安德烈夫束缚态的出现,可以达到零偏置。在扫描化学势时,我们偶尔也会观察到负的非局部电导,这提供了交叉安德烈夫反射的证据。该信号甚至可以在比铌或近似纳米线的超导相干长度长得多的长度尺度上被检测到。我们认为这种长程效应是由于近端纳米线中无序的复杂作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Long-range crossed Andreev reflection in a topological insulator nanowire proximitized by a superconductor

Long-range crossed Andreev reflection in a topological insulator nanowire proximitized by a superconductor

Crossed Andreev reflection is a non-local transport phenomenon that creates and detects Cooper pair correlations between distant locations. It is also the basis of Cooper pair splitting to generate remote entanglement. Although crossed Andreev reflection has been extensively studied in semiconductors proximity-coupled to a superconductor, observing it in a topological insulator has been very difficult. Here we report the observation of this effect in a proximitized topological insulator nanowire. We perform local and non-local conductance spectroscopy on mesoscopic devices in which superconducting niobium and metallic contacts are connected to a bulk-insulating nanowire. In our local conductance measurements we detect a hard gap and the appearance of Andreev bound states that can reach zero bias. We also occasionally observe a negative non-local conductance when sweeping the chemical potential, providing evidence of crossed Andreev reflection. This signal is detected even over length scales much longer than the expected superconducting coherence length of either niobium or the proximitized nanowire. We suggest that this long-range effect is due to the intricate role of disorder in proximitized nanowires.

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来源期刊
Nature Physics
Nature Physics 物理-物理:综合
CiteScore
30.40
自引率
2.00%
发文量
349
审稿时长
4-8 weeks
期刊介绍: Nature Physics is dedicated to publishing top-tier original research in physics with a fair and rigorous review process. It provides high visibility and access to a broad readership, maintaining high standards in copy editing and production, ensuring rapid publication, and maintaining independence from academic societies and other vested interests. The journal presents two main research paper formats: Letters and Articles. Alongside primary research, Nature Physics serves as a central source for valuable information within the physics community through Review Articles, News & Views, Research Highlights covering crucial developments across the physics literature, Commentaries, Book Reviews, and Correspondence.
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