近日，马克斯·普朗克物质结构与动力学研究所Philip J. W. Moll团队研究了Kagome晶体中的多体干涉。相关论文于2025年10月29日发表在《自然》杂志上。

当金属中的电子集体运动时，会涌现出超越单个粒子行为的全新物理现象和电子功能。迄今为止，相干集体电荷运动主要在被观察到源于库珀对形成的超导体中。

研究组报道了Kagome金属CsV₃Sb₅在正常态下出现相干电荷输运的实验证据，这预示着一种独特的集体电子态。其表征是在面内磁场作用下，微米级晶柱中呈现出一组磁阻振荡——振荡周期由穿过相邻Kagome层间的磁通量子数h/e决定，实质上构成了层间阿哈罗诺夫-玻姆干涉仪。该现象的合作本质通过以下特征得以证实：具有离散振荡频率间突跃的非解析角依赖性，以及在远超单粒子平均自由程的长度尺度上持续存在的振荡行为。

值得注意的是，振荡幅度与CsV₃Sb₅中报道的其他异常电子响应相吻合，表明存在建立内禀相干性的深层机制。这些发现为理解Kagome金属中争议性关联序的本质提供了新视角，并将CsV₃Sb₅确立为在非超导状态下实现长程相干电荷输运的研究平台——这为超越传统模型的关联电子系统相干性研究开辟了全新方向。

附：英文原文

Title: Many-body interference in kagome crystals

Author: Guo, Chunyu, Wang, Kaize, Zhang, Ling, Putzke, Carsten, Chen, Dong, van Delft, Maarten R., Wiedmann, Steffen, Balakirev, Fedor F., McDonald, Ross D., Gutierrez-Amigo, Martin, Alkorta, Manex, Errea, Ion, Vergniory, Maia G., Oka, Takashi, Moessner, Roderich, Fischer, Mark H., Neupert, Titus, Felser, Claudia, Moll, Philip J. W.

Issue&Volume: 2025-10-29

Abstract: When electrons in metals act collectively, they enable emergent phenomena and electronic functionalities that transcend the behaviour of individual particles1. Coherent collective charge motion has so far been observed primarily in superconductors, in which it arises with the formation of Cooper pairs2,3. Here we report experimental evidence for coherent charge transport in the normal state of the kagome metal CsV3Sb5, indicative of a distinct collective electronic state. The signature is a set of magnetoresistance oscillations in mesoscopic crystalline pillars under in-plane magnetic fields, with a periodicity determined by the number of magnetic flux quanta h/e threading between adjacent kagome layers—effectively forming an interlayer Aharonov–Bohm interferometer. The cooperative nature of this phenomenon is evidenced by a non-analytic angular dependence characterized by abrupt transitions between discrete oscillation frequencies and its persistence over length scales that exceed the single-particle mean free path. Notably, the oscillation amplitude matches other anomalous electronic responses reported in CsV3Sb5, pointing to an underlying mechanism that establishes intrinsic coherence. These findings shed new light on the debated nature of correlated order in kagome metals and establish CsV3Sb5 as a platform for realizing long-range coherent charge transport in the absence of superconductivity—opening new directions for coherence in correlated electron systems beyond conventional models.

DOI: 10.1038/s41586-025-09659-8

Source: https://www.nature.com/articles/s41586-025-09659-8