Impact of Andreev Bound States within the Leads of a Quantum Dot Josephson Junction

IF 15.7 1区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Physical Review X Pub Date : 2025-03-03 DOI:10.1103/physrevx.15.011046

Alberto Bordin, Florian J. Bennebroek Evertsz’, Gorm O. Steffensen, Tom Dvir, Grzegorz P. Mazur, David van Driel, Nick van Loo, Jan Cornelis Wolff, Erik P. A. M. Bakkers, Alfredo Levy Yeyati, Leo P. Kouwenhoven

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引用次数: 0

Abstract

Detection and control of Andreev bound states (ABSs) localized at semiconductor-superconductor interfaces are essential for their use in quantum applications. Here we investigate the impact of ABSs on the supercurrent through a Josephson junction containing a quantum dot (QD). Additional normal-metal tunneling probes on both sides of the junction unveil the ABSs residing at the semiconductor-superconductor interfaces. Such knowledge provides an ingredient missing in previous studies, improving the connection between theory and experimental data. By varying the ABS energies using electrostatic gates, we show control of the switching current, with the ability to alter it by more than an order of magnitude. Finally, the large degree of ABS tunability allows us to realize a three-site Andreev molecule in which the central QD is screened by both ABSs. This system is studied simultaneously using both supercurrent and spectroscopy.

Published by the American Physical Society

2025

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量子点Josephson结导联中Andreev束缚态的影响

半导体-超导体界面上的Andreev束缚态（ABSs）的检测和控制对于它们在量子应用中的应用至关重要。本文研究了abs对通过含有量子点（QD）的约瑟夫森结的超电流的影响。在结的两侧附加的正常金属隧道探针揭示了驻留在半导体-超导体界面上的abs。这些知识提供了以前研究中缺少的成分，改善了理论和实验数据之间的联系。通过使用静电门改变ABS能量，我们展示了开关电流的控制，能够通过超过一个数量级来改变它。最后，ABS的大程度可调性使我们实现了一个三位点的Andreev分子，其中中心QD被两个ABS筛选。利用超电流和光谱学同时对该系统进行了研究。2025年由美国物理学会出版

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Physical Review X PHYSICS, MULTIDISCIPLINARY-

CiteScore

24.60

自引率

1.60%

发文量

197

审稿时长

3 months

期刊介绍： Physical Review X (PRX) stands as an exclusively online, fully open-access journal, emphasizing innovation, quality, and enduring impact in the scientific content it disseminates. Devoted to showcasing a curated selection of papers from pure, applied, and interdisciplinary physics, PRX aims to feature work with the potential to shape current and future research while leaving a lasting and profound impact in their respective fields. Encompassing the entire spectrum of physics subject areas, PRX places a special focus on groundbreaking interdisciplinary research with broad-reaching influence.