High-mobility heavy quasiparticles in a van der Waals antiferromagnetic dense Kondo lattice CeTe$_3$

• URL: http://arxiv.org/abs/2506.23653v1
• Date: Mon, 30 Jun 2025 09:27:56 GMT
• Title: High-mobility heavy quasiparticles in a van der Waals antiferromagnetic dense Kondo lattice CeTe$_3$
• Abstract summary: Two-dimensional van der Waals (vdW) materials exhibit high carrier mobility and tunability.<n>It is challenging to identify a vdW material with both high mobility and strong correlation.<n>We observe significant effective-mass enhancement in CeTe$_3$ at low temperature.
• Score: 20.547989107072834
• License: http://creativecommons.org/licenses/by/4.0/
• 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 vdW antiferromagnetic metal with high-mobility heavy quasiparticles, potentially unlocking new device concepts.

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