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arXiv · 2506.23653

Kondo-coupled van der Waals antiferromagnet with high-mobility quasiparticles

Hai Zeng·Yang Zhang·Bingke Ji·Jiaqiang Cai·Shuo Zou·Zhuo Wang·Chao Dong·Kangjian Luo·Yang Yuan·Kai Wang·Jinglei Zhang·Chuanyin Xi·Junfeng Wang·Liang Li·Yaomin Dai·Jing Li·Yongkang Luo
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Abstract

Two-dimensional van der Waals (vdW) materials exhibit high carrier mobility and tunability, making them suitable for low-power, high-performance electronic and spintronic applications. Incorporating narrow-band electronic correlation effects could further promote tunability, though mass renormalization may impact carrier mobility. It is therefore challenging to identify a vdW material with both high mobility and strong correlation. Herein, by a combination of optical spectroscopy and high-field quantum-oscillation measurements, we observe significant effective-mass enhancement in CeTe$_3$ at low temperature, arising from not only the band-structure modulation by antiferromagnetic ordering but also the narrow-band correlation effect. Despite the mass enhancement, the quantum mobility surprisingly \textit{increases} and reaches $\sim$2403 cm$^2$/Vs, likely benefiting from topological protection. Remarkably, these unique properties are maintained in atomically thin nanoflakes with quantum mobility enhanced to $\sim$3158 cm$^2$/Vs. Thus, CeTe$_3$ emerges as a promising Kondo-coupled vdW antiferromagnetic metal with high-mobility quasiparticles, potentially unlocking new device concepts.

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Hai Zeng, Yang Zhang, Bingke Ji, Jiaqiang Cai, Shuo Zou, Zhuo Wang, Chao Dong, Kangjian Luo, Yang Yuan, Kai Wang, Jinglei Zhang, Chuanyin Xi, Junfeng Wang, Liang Li, Yaomin Dai, Jing Li, Yongkang Luo. 2025-06-30. Kondo-coupled van der Waals antiferromagnet with high-mobility quasiparticles. https://doi.org/10.1016/j.newton.2025.100320

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