Electron Wave Behavior in Kagome Metals Promises Long-Range Coherence

On April 18, 2025, a team of researchers published their findings on Long-range electron coherence in Kagome metals, revealing unexpected phase coherence in CsV Sb at elevated temperatures and larger scales. This discovery highlights Kagome metals as promising candidates for sustaining electron coherence, offering insights into quantum systems and potential technological applications.

The study demonstrates magnetoresistance oscillations in CsV Sb Kagome metals under conditions unfavorable for typical electron interference, occurring at temperatures above 20 K and micrometer-scale devices. These oscillations exhibit periodicity tied to flux quanta between Kagome layers, resembling an atomic-scale Aharonov-Bohm interferometer. The findings reveal a cooperative mechanism enabling intrinsic electron coherence in Kagome metals, offering insights into correlated order and establishing them as promising platforms for long-range interaction-stabilized coherence in metallic systems.

Recent research has advanced our understanding of quantum materials by leveraging high-field experiments to observe quantum oscillations in resistivity and magnetization. These experiments utilize magnetic fields as strong as 60 Tesla, capitalizing on the Shubnikov-de Haas (SdH) and de Haas-van Alphen (dHvA) effects. These phenomena occur when a material’s electronic properties oscillate under varying magnetic fields, offering insights into its underlying electronic structure.

The findings reveal critical details about the Fermi surface topology and effective mass anisotropy of the materials studied. The Fermi surface, which determines key material properties such as electrical conductivity and thermal behavior, is central to this research. Effective mass anisotropy refers to how electrons behave as if they possess different masses in various directions, leading to unique electronic behaviors.

High-field experiments are particularly valuable because they amplify quantum effects, enabling researchers to study these phenomena with greater precision. The observed oscillations in magnetoresistance and Hall resistance demonstrate strong quantum behavior, even at elevated temperatures, suggesting resilience against thermal disruption. This robustness is significant for practical applications, as it indicates that quantum effects can persist under less-than-ideal conditions.

Theoretical models predicting the Fermi surface topology align closely with experimental results, validating both the methodologies employed and the fundamental physics at play. This consistency underscores the reliability of high-field experiments in probing the electronic structure of quantum materials. By inducing quantum oscillations through intense magnetic fields, researchers gain detailed insights into how electrons move and interact within these materials.

This work not only deepens our understanding of quantum materials but also opens new possibilities for technological innovation. The ability to precisely map electronic structures could pave the way for advancements in electronics and other fields that leverage quantum effects. As research in this area continues, it promises to further illuminate the complex world of quantum materials, offering new opportunities for scientific discovery and practical application.