Many-body interference in kagome crystals

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date

2025-11-06

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Department of Applied Physics

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en

Pages

6

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Nature, Volume 647, issue 8088, pp. 68-73

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.

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Publisher Copyright: © The Author(s) 2025.

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DOI

10.1038/s41586-025-09659-8

Citation

Guo, C, Wang, K, Zhang, L, Putzke, C, Chen, D, van Delft, M R, Wiedmann, S, Balakirev, F F, McDonald, R D, Gutierrez-Amigo, M, Alkorta, M, Errea, I, Vergniory, M G, Oka, T, Moessner, R, Fischer, M H, Neupert, T, Felser, C & Moll, P J W 2025, 'Many-body interference in kagome crystals', Nature, vol. 647, no. 8088, pp. 68-73. https://doi.org/10.1038/s41586-025-09659-8

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https://urn.fi/URN:NBN:fi:aalto-202511198840

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[article-cris] Perustieteiden korkeakoulu / SCI