arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2404.09784cond-mat.supr-con
收藏

Nb/Au/Nb约瑟夫森结中安德列夫输运的量子尺寸效应:从头算与实验结合研究

Quantum size effects on Andreev transport in Nb/Au/Nb Josephson junctions: A combined ab-initio and experimental study

Hiroki Yamazaki, Gabor Csire, Nora Kucska, Nic Shannon, Balazs Gyorffy, Hidenori Takagi, Balazs Ujfalussy

AI总结:

该研究通过实验测量与相对论性从头算理论结合,探究Nb/Au/Nb三层膜超导参数对Au层厚度的非单调依赖,揭示安德列夫束缚态介导的超导邻近效应与量子尺寸效应的相互作用,为调控超导多层膜输运性质提供新方法。

摘要:

我们测量了单畴外延生长的Nb(110)/Au(111)/Nb(110)三层膜的临界电流密度、超导相干长度和超导转变温度,这些参数均表现出对Au层厚度的非单调依赖关系。我们将实验结果与纳入超导关联的相对论性从头算理论的预测进行了对比,发现二者吻合良好,这种吻合源于由安德列夫束缚态介导的超导邻近效应与量子尺寸效应之间的复杂相互作用。这些结果表明,量子尺寸效应可提供一种调控超导多层膜输运性质的系统性方法。

英文摘要:

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 non-monotonic dependence on the thickness of the Au layer. These results are compared with the predictions of a relativistic, ab-initio 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.

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。

↑