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Charge density wave (CDW) orders in vanadium-based kagome metals haverecently received tremendous attention due to their unique properties andintricate interplay with exotic correlated phenomena, topological andsymmetry-breaking states. However, the origin of the CDW order remains a topicof debate. The discovery of ScV$_{6}$Sn$_{6}$, a vanadium-based bilayer kagomemetal exhibiting an in-plane $\sqrt{3}$ x $\sqrt{3} $ $\textit{R}$30${\deg}$CDW order with time-reversal symmetry breaking, provides a novel platform toexplore the underlying mechanism behind the unconventional CDW. Here, wecombine high-resolution angle-resolved photoemission spectroscopy, Ramanscattering measurements and density functional theory to investigate theelectronic structures and phonon modes of ScV$_{6}$Sn$_{6}$ and their evolutionwith temperature. We identify topologically nontrivial Dirac surface states andmultiple van Hove singularities (VHSs) in the vicinity of the Fermi level, withone VHS near the K point exhibiting nesting wave vectors in proximity to the$\sqrt{3}$ x $\sqrt{3}$ $\textit{R}$30${\deg}$ CDW wave vector. Additionally,Raman measurements indicate a strong intrinsic electron-phonon coupling inScV$_{6}$Sn$_{6}$, as evidenced by the presence of a two-phonon mode and alarge frequency amplitude mode. Our findings highlight the fundamental role oflattice degrees of freedom in promoting the CDW in ScV$_{6}$Sn$_{6}$ andprovide important insights into the fascinating correlation phenomena observedin kagome metals.

Phonon promoted charge density wave in topological kagome metal ScV$_{6}$Sn$_{6}$