Tunneling into the Vortex State of NbSe2 with van der Waals Junctions,Nano Letters

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Tunneling into the Vortex State of NbSe2 with van der Waals Junctions
Nano Letters ( IF 9.6 ) Pub Date : 2018-11-26 00:00:00 , DOI: 10.1021/acs.nanolett.8b03605
Tom Dvir ₁ , Marco Aprili ₂ , Charis H. L. Quay ₂ , Hadar Steinberg ₁

Affiliation

We have performed device-based tunneling spectroscopy of NbSe₂ in the vortex state with a magnetic field applied both parallel and perpendicular to the a–b plane. Our devices consist of layered semiconductors placed on top of exfoliated NbSe₂ using the van der Waals transfer technique. At zero field, the spectrum exhibits a hard gap, and the quasiparticle peak is split into low- and high-energy features. The two features, associated with the effective two-band nature of superconductivity in NbSe₂, exhibit markedly distinct responses to the application of magnetic field, suggesting an order-of-magnitude difference in the spatial extent of the vortex cores of the two bands. At energies below the superconducting gap, the hard gap gives way to vortex-bound Caroli–de Gennes–Matricon states, allowing the detection of individual vortices as they enter and exit the junction. Analysis of the subgap spectra upon application of parallel magnetic field allows us to track the process of vortex surface formation and spatial rearrangement in the bulk.

中文翻译：

通过范德华结向NbSe ₂的涡旋态隧穿

我们已经对NbSe ₂进行了基于器件的隧穿光谱研究，该结构处于涡旋状态，同时施加了平行于和垂直于a – b平面的磁场。我们的设备由使用范德华斯转移技术放置在片状NbSe ₂上方的分层半导体组成。在零场处，光谱显示出一个硬间隙，并且准粒子峰分为低能和高能特征。这两个特征与NbSe ₂中超导的有效两频性质有关，显示出对磁场施加的明显不同的响应，表明两个频带的涡旋核的空间范围的量级差异。在低于超导间隙的能量处，硬间隙让位于涡旋结合的Caroli-de Gennes-Matricon状态，从而可以检测单个涡旋进入和离开交界处的情况。在施加平行磁场的情况下，对亚能隙谱的分析使我们能够跟踪整体中涡旋表面形成和空间重排的过程。

更新日期：2018-11-26

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