%0 Journal Article %1 Uykur2022 %A Uykur, Ece %A Ortiz, Brenden R. %A Wilson, Stephen D. %A Dressel, Martin %A Tsirlin, Alexander A. %D 2022 %J npj Quantum Materials %K density-wave-instability kagome-metal optical-detection superconductivity %N 1 %P 16 %R 10.1038/s41535-021-00420-8 %T Optical detection of the density-wave instability in the kagome metal KV3Sb5 %U https://doi.org/10.1038/s41535-021-00420-8 %V 7 %X Coexisting density-wave and superconducting states along with the large anomalous Hall effect in the absence of local magnetism remain intriguing and enigmatic features of the AV3Sb5 kagome metals (Aþinspace=þinspaceK, Rb, Cs). Here, we demonstrate via optical spectroscopy and density-functional calculations that low-energy dynamics of KV3Sb5 is characterized by unconventional localized carriers, which are strongly renormalized across the density-wave transition and indicative of electronic correlations. Strong phonon anomalies are prominent not only below the density-wave transition, but also at high temperatures, suggesting an intricate interplay of phonons with the underlying electronic structure. We further propose the star-of-David and tri-hexagon (inverse star-of-David) configurations for the density-wave order in KV3Sb5. These configurations are strongly reminiscent of p-wave states expected in the Hubbard model on the kagome lattice at the filling level of the van Hove singularity. The proximity to this regime should have intriguing and far-reaching implications for the physics of KV3Sb5 and related materials.

@article{Uykur2022, abstract = {Coexisting density-wave and superconducting states along with the large anomalous Hall effect in the absence of local magnetism remain intriguing and enigmatic features of the AV3Sb5 kagome metals (A{\thinspace}={\thinspace}K, Rb, Cs). Here, we demonstrate via optical spectroscopy and density-functional calculations that low-energy dynamics of KV3Sb5 is characterized by unconventional localized carriers, which are strongly renormalized across the density-wave transition and indicative of electronic correlations. Strong phonon anomalies are prominent not only below the density-wave transition, but also at high temperatures, suggesting an intricate interplay of phonons with the underlying electronic structure. We further propose the star-of-David and tri-hexagon (inverse star-of-David) configurations for the density-wave order in KV3Sb5. These configurations are strongly reminiscent of p-wave states expected in the Hubbard model on the kagome lattice at the filling level of the van Hove singularity. The proximity to this regime should have intriguing and far-reaching implications for the physics of KV3Sb5 and related materials.}, added-at = {2022-03-16T09:39:39.000+0100}, author = {Uykur, Ece and Ortiz, Brenden R. and Wilson, Stephen D. and Dressel, Martin and Tsirlin, Alexander A.}, biburl = {https://puma.ub.uni-stuttgart.de/bibtex/21b58b0fafb306f2c06cbfa17ea24c5c3/dr.helgakumric}, day = 28, doi = {10.1038/s41535-021-00420-8}, interhash = {2517b0dd0e61adcd9f20340c4e7ae116}, intrahash = {1b58b0fafb306f2c06cbfa17ea24c5c3}, issn = {2397-4648}, journal = {npj Quantum Materials}, keywords = {density-wave-instability kagome-metal optical-detection superconductivity}, month = jan, number = 1, pages = 16, timestamp = {2022-03-16T08:39:39.000+0100}, title = {Optical detection of the density-wave instability in the kagome metal KV3Sb5}, url = {https://doi.org/10.1038/s41535-021-00420-8}, volume = 7, year = 2022 }