论文标题
在nbse $ _2 $的缺陷量量子点中的Kondo效应
Kondo Effect in Defect-bound Quantum Dots Coupled to NbSe$_2$
论文作者
论文摘要
我们报告了载有一个缺陷量量子点的范德华隧道设备的制造，该量子点耦合到NBSE $ _2 $。我们发现，在应用磁场后，该设备表现出零偏置电导峰。在较高场上拆分的峰与临床效应有关。同时，连接处在有限偏见下保留常规的准粒子隧穿特征。超导差距和围绕效应的这种共存是不寻常的，并通过注意到NBSE $ _2 $的超导状态的两间隙性质来解释，其中磁场抑制了与SE频段相关的低能差距。我们的数据表明，范德华体系结构以及其中的缺陷界点可以作为研究在非常规超导体中研究Kondo筛选和超导配对的新颖有效平台。
We report the fabrication of a van der Waals tunneling device hosting a defect-bound quantum dot coupled to NbSe$_2$. We find that upon application of magnetic field, the device exhibits a zero-bias conductance peak. The peak, which splits at higher fields, is associated with a Kondo effect. At the same time, the junction retains conventional quasiparticle tunneling features at finite bias. Such coexistence of a superconducting gap and a Kondo effect are unusual, and are explained by noting the two-gap nature of the superconducting state of NbSe$_2$, where a magnetic field suppresses the low energy gap associated with the Se band. Our data shows that van der Waals architectures, and defect-bound dots in them, can serve as a novel and effective platform for investigating the interplay of Kondo screening and superconducting pairing in unconventional superconductors.
