Constructing the Fulde–Ferrell–Larkin–Ovchinnikov State in a CrOCl/NbSe2 van der Waals Heterostructure

IF 9.6 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Nano Letters Pub Date : 2024-10-03 DOI:10.1021/acs.nanolett.4c03079

Yifan Ding, Jiadian He, Shihao Zhang, Huakun Zuo, Pingfan Gu, Jiliang Cai, Xiaohui Zeng, Pu Yan, Jun Cai, Kecheng Cao, Kenji Watanabe, Takashi Taniguchi, Peng Dong, Yiwen Zhang, Yueshen Wu, Xiang Zhou, Jinghui Wang, Yulin Chen, Yu Ye, Jianpeng Liu, Jun Li

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Abstract

Time reversal symmetry breaking in superconductors, resulting from external magnetic fields or spontaneous magnetization, often leads to unconventional superconducting properties. In this way, an intrinsic phenomenon called the Fulde–Ferrell–Larkin–Ovchinnikov (FFLO) state may be realized by the Zeeman effect. Here, we construct the FFLO state in an artificial CrOCl/NbSe₂ van der Waals (vdW) heterostructure by utilizing the superconducting proximity effect of NbSe₂ flakes. The proximity-induced superconductivity demonstrates a considerably weak gap of about 0.12 meV, and the in-plane upper critical field reveals the behavior of the FFLO state. First-principles calculations uncover the origin of the proximitized superconductivity, which indicates the importance of Cr vacancies or line defects in CrOCl. Moreover, the FFLO state could be induced by the inherent large spin splitting in CrOCl. Our findings not only provide a practical scheme for constructing the FFLO state but also inspire the discovery of an exotic FFLO state in other two-dimensional vdW heterostructures.

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在 CrOCl/NbSe2 范德华异质结构中构建富尔德-费雷尔-拉金-奥夫钦尼科夫态

由外部磁场或自发磁化导致的超导体时间反转对称性破缺往往会产生非常规的超导特性。在这种情况下，一种被称为富尔德-费雷尔-拉金-奥夫钦尼科夫（FFLO）态的内在现象可能会通过泽曼效应得以实现。在这里，我们利用 NbSe2 薄片的超导邻近效应，在人造 CrOCl/NbSe2 范德瓦耳斯（vdW）异质结构中构建了 FFLO 状态。邻近效应诱导的超导显示出相当弱的间隙（约 0.12 meV），面内上临界场揭示了 FFLO 状态的行为。第一原理计算揭示了近位超导的起源，这表明 CrOCl 中的铬空位或线缺陷非常重要。此外，CrOCl 中固有的大自旋分裂也可能诱发 FFLO 状态。我们的发现不仅为构建 FFLO 状态提供了一个实用方案，而且还启发了在其他二维 vdW 异质结构中发现奇异的 FFLO 状态。

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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.