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.
%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
}