Charge-density wave mediated quasi-one-dimensional Kondo lattice in stripe-phase monolayer 1T-NbSe2

Zhen-Yu Liu, Heng Jin, Yao Zhang, Kai Fan, Ting-Fei Guo, Hao-Jun Qin, Lan-Fang Zhu, Lian-Zhi Yang, Wen-Hao Zhang, Bing Huang () and Ying-Shuang Fu ()
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Zhen-Yu Liu: Huazhong University of Science and Technology
Heng Jin: Beijing Normal University
Yao Zhang: Huazhong University of Science and Technology
Kai Fan: Huazhong University of Science and Technology
Ting-Fei Guo: Huazhong University of Science and Technology
Hao-Jun Qin: Huazhong University of Science and Technology
Lan-Fang Zhu: Huazhong University of Science and Technology
Lian-Zhi Yang: Huazhong University of Science and Technology
Wen-Hao Zhang: Huazhong University of Science and Technology
Bing Huang: Beijing Normal University
Ying-Shuang Fu: Huazhong University of Science and Technology

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract The heavy fermion physics is dictated by subtle competing exchange interactions, posing a challenge to their understanding. One-dimensional (1D) Kondo lattice model has attracted special attention in theory, because of its exact solvability and expected unusual quantum criticality. However, such experimental material systems are extremely rare. Here, we demonstrate the realization of quasi-1D Kondo lattice behavior in a monolayer van der Waals crystal NbSe2, that is driven into a stripe phase via Se-deficient line defects. Spectroscopic imaging scanning tunneling microscopy measurements and first-principles calculations indicate that the stripe-phase NbSe2 undergoes a novel charge-density wave transition, creating a matrix of local magnetic moments. The Kondo lattice behavior is manifested as a Fano resonance at the Fermi energy that prevails the entire film with a high Kondo temperature. Importantly, coherent Kondo screening occurs only in the direction of the stripes. Upon approaching defects, the Fano resonance exhibits prominent spatial 1D oscillations along the stripe direction, reminiscent of Kondo holes in a quasi-1D Kondo lattice. Our findings provide a platform for exploring anisotropic Kondo lattice behavior in the monolayer limit.

Date: 2024
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DOI: 10.1038/s41467-024-45335-7

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