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Scientific article
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English

Phonon promoted charge density wave in topological kagome metal ScV6Sn6

Published inNature communications, vol. 15, no. 1
Publication date2024-02-23
First online date2024-02-23
Abstract

Charge density wave (CDW) orders in vanadium-based kagome metals have recently received tremendous attention, yet their origin remains a topic of debate. The discovery of ScV 6 Sn 6 , a bilayer kagome metal featuring an intriguing $$\sqrt{3}\times\sqrt{3}\times3$$ 3 × 3 × 3 CDW order, offers a novel platform to explore the underlying mechanism behind the unconventional CDW. Here, we combine high-resolution angle-resolved photoemission spectroscopy, Raman scattering and density functional theory to investigate the electronic structure and phonon modes of ScV 6 Sn 6 . We identify topologically nontrivial surface states and multiple van Hove singularities (VHSs) in the vicinity of the Fermi level, with one VHS aligning with the in-plane component of the CDW vector near the $$\bar{K}$$ K ¯ point. Additionally, Raman measurements indicate a strong electron-phonon coupling, as evidenced by a two-phonon mode and new emergent modes. Our findings highlight the fundamental role of lattice degrees of freedom in promoting the CDW in ScV 6 Sn 6 .

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Citation (ISO format)
HU, Yong et al. Phonon promoted charge density wave in topological kagome metal ScV<sub>6</sub>Sn<sub>6</sub>. In: Nature communications, 2024, vol. 15, n° 1. doi: 10.1038/s41467-024-45859-y
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ISSN of the journal2041-1723
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