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arXiv 2403.03324cond-mat.mes-hallcond-mat.supr-con
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超导 NbGe$_2$ 中手性表面态的观测

Observation of Chiral Surface State in Superconducting NbGe$_2$

Mengyu Yao, Martin Gutierrez-Amigo, Subhajit Roychowdhury, Ion Errea, Alexander Fedorov, Vladimir N. Strocov, Maia G. Vergniory, Claudia Felser

AI总结:

该研究结合 ARPES、输运测量与从头算,首次在 NbGe$_2$ 中观测到手性表面态,并揭示其 Weyl 费米子、van Hove 奇点及低温超导特征。

摘要:

量子材料中拓扑与超导之间的相互作用蕴含着丰富且有待发现的物理。在本研究中,我们利用高分辨率角分辨光电子能谱(ARPES)、输运测量和从头算计算,研究了非简单空间群手性超导体 NbGe$_2$ 的拓扑性质和超导性。ARPES 数据揭示了(100)表面上源于其固有手性晶体结构的奇异手性表面态。支持性计算表明,NbGe$_2$ 的体相电子结构中可能存在难以捉摸的 Weyl 费米子。此外,我们还发现了可增强多体相互作用的 van Hove 奇点的特征。另外,输运测量表明 NbGe$_2$ 在 2 K 以下表现出超导性。总体而言,我们的综合结果首次提供了具体证据,表明 NbGe$_2$ 是一个很有前景的平台,可用于研究手性量子材料中非平庸能带拓扑、可能存在的 Weyl 费米子、van Hove 奇点与超导性之间的相互作用。

英文摘要:

The interplay between topology and superconductivity in quantum materials harbors rich physics ripe for discovery. In this study, we investigate the topological properties and superconductivity of the nonsymmorphic chiral superconductor NbGe$_2$ using high-resolution angle-resolved pho-toemission spectroscopy (ARPES), transport measurements, and ab initio calculations. The ARPES data revealed exotic chiral surface states on the (100) surface originating from the inherent chiral crystal structure. Supporting calculations indicate that NbGe$_2$ likely hosts elusive Weyl fermions in its bulk electronic structure. Furthermore, we uncovered the signatures of van Hove singularities that can enhance many-body interactions. Additionally, transport measurements demonstrated that NbGe$_2$ exhibits superconductivity below 2K. Overall, our comprehensive results provide the first concrete evidence that NbGe$_2$ is a promising platform for investigating the interplay between non-trivial band topology, possible Weyl fermions, van Hove singularities, and superconductivity in chiral quantum materials.

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。

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