Nb/Au/Nb Josephson结中Andreev输运的量子尺寸效应：从头算和实验研究

IF 8.1 1区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Physical review letters Pub Date : 2025-05-16 DOI:10.1103/physrevlett.134.196002

Hiroki Yamazaki, Gábor Csire, Nóra Kucska, Nic Shannon, Balázs Győrffy, Hidenori Takagi, Balázs Újfalussy

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引用次数: 0

摘要

我们测量了单畴外延生长Nb(110)/Au(111)/Nb（110）三层的临界电流密度、超导相干长度和超导转变温度，所有这些都显示出Au层厚度的非单调依赖性。这些结果与包含超导相关性的相对论理论的预测进行了比较。我们发现，在Andreev束缚态介导下，超导接近和量子尺寸效应之间存在丰富的相互作用，这与实验结果很吻合。这些结果表明，量子尺寸效应可以提供一种系统的方法来控制超导多层膜的输运性质。2025年由美国物理学会出版

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Quantum Size Effects on Andreev Transport in Nb/Au/Nb Josephson Junctions: A Combined Ab Initio and Experimental Study

We have measured the critical current density, superconducting coherence length, and superconducting transition temperature of single-domain, epitaxially grown Nb(110)/Au(111)/Nb(110) trilayers, all of which show a nonmonotonic dependence on the thickness of the Au layer. These results are compared with the predictions of a relativistic, theory, which incorporates superconducting correlations. We find good agreement with experiment, coming from a rich interplay between superconducting proximity and quantum size effects, mediated by Andreev bound states. These results suggest that quantum size effects could provide a systematic method of controlling the transport properties of superconducting multilayers.

Published by the American Physical Society

2025

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来源期刊

Physical review letters 物理-物理：综合

CiteScore

16.50

自引率

7.00%

发文量

2673

审稿时长

2.2 months

期刊介绍： Physical review letters(PRL)covers the full range of applied, fundamental, and interdisciplinary physics research topics: General physics, including statistical and quantum mechanics and quantum information Gravitation, astrophysics, and cosmology Elementary particles and fields Nuclear physics Atomic, molecular, and optical physics Nonlinear dynamics, fluid dynamics, and classical optics Plasma and beam physics Condensed matter and materials physics Polymers, soft matter, biological, climate and interdisciplinary physics, including networks