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- Title
Charge-density wave mediated quasi-one-dimensional Kondo lattice in stripe-phase monolayer 1T-NbSe<sub>2</sub>.
- Authors
Liu, Zhen-Yu; Jin, Heng; Zhang, Yao; Fan, Kai; Guo, Ting-Fei; Qin, Hao-Jun; Zhu, Lan-Fang; Yang, Lian-Zhi; Zhang, Wen-Hao; Huang, Bing; Fu, Ying-Shuang
- 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. The realization of heavy-fermion physics in van der Waals materials with d-electrons has attracted attention recently. Here the authors present evidence for a quasi-1D Kondo lattice in monolayer NbSe2, driven into a stripe phase by Se-deficient line defects created during growth.
- Subjects
CHARGE density waves; SCANNING tunneling microscopy; MONOMOLECULAR films; DELOCALIZATION energy; FANO resonance; KONDO effect; ELECTRON gas
- Publication
Nature Communications, 2024, Vol 15, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-024-45335-7