Optical study of RbV${}_3$Sb${}_5$: Multiple density-wave gaps and phonon anomalies

Abstract

Temperature-dependent reflectivity studies on the non-magnetic kagome metal RbV${}_3$Sb${}_5$ in a broad energy range (50 cm${}^{-1}$ $-$ 20000 cm${}^{-1}$, equivalent to 6 meV $-$ 2.5 eV) down to 10 K are reported. Below $T_{\mathrm{CDW}}=102$ K, the optical spectra demonstrate a prominent spectral-weight transfer from low to higher energies as the fingerprint of the charge-density wave (CDW) formation with the opening of a partial gap. A detailed analysis reveals two energy scales of, respectively, $\sim$ 800 cm${}^{-1}$ (100 meV) and 360 cm${}^{-1}$ (45 meV), the latter visible below 50 K only. Additionally, two modes at, respectively, 160 cm${}^{-1}$ (20 meV) and 430 cm${}^{-1}$ (53 meV) can be traced both above and below $T_{\mathrm{CDW}}$. They show strong anomalies already above $T_{\mathrm{CDW}}$ with a further renormalization across the transition, suggesting the importance of the electron-phonon coupling in RbV${}_3$Sb${}_5$ in both normal and CDW states. While the 160 cm${}^{-1}$ mode can be attributed to the E${}_{1u}$ phonon, the 430 cm${}^{-1}$ mode could not be reproduced in our phonon calculations. The antiresonance nature of this mode suggests a nontrivial electron-phonon coupling in RbV${}_3$Sb${}_5$. A distinct localization peak observed at all temperatures signals damped electron dynamics, whereas the reduced Drude spectral weight manifests moderate deviations from the band picture in RbV${}_3$Sb${}_5$.

14 pages, 12 figures

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Cited by in corpus (27)

• AV${}_3$Sb${}_5$ Kagome Superconductors: Progress and Future Directions
• Tunable nodal kagome superconductivity in charge ordered RbV3Sb5
• A unique van Hove singularity in kagome superconductor CsV${}_{3-x}$Ta${}_x$Sb${}_5$ with enhanced superconductivity
• Optical spectroscopy and band structure calculations of structural phase transition in the Vanadium-based kagome metal ScV${}_6$Sn${}_6$
• Loop-current charge density wave driven by long-range Coulomb repulsion on the kagome lattice
• Fermi-liquid behavior of non-altermagnetic RuO${}_2$
• Intriguing Low-Temperature Phase in the Antiferromagnetic Kagome Metal FeGe
• Effects of Nb Doping on the Charge-Density Wave and Electronic Correlations in the Kagome Metal Cs(V${}_{1-x}$Nb${}_x$)${}_3$Sb${}_5$
• Effect of magnetism and phonons on localized carriers in the ferrimagnetic kagome metals GdMn${}_6$Sn${}_6$ and TbMn${}_6$Sn${}_6$
• Electronic Correlations and Evolution of the Charge-Density Wave in the Kagome Metals $A$V${}_3$Sb${}_5$ ($A$ = K, Rb, Cs)
• Pressure evolution of electron dynamics in the superconducting kagome metal CsV${}_3$Sb${}_5$
• Kagome metals
• Signatures of van Hove singularities in the anisotropic in-plane optical conductivity of the topological semimetal Nb${}_3$SiTe${}_6$
• Two-dimensional phase diagram of the charge density wave in doped CsV${}_3$Sb${}_5$
• Revealing Rotational Symmetry Breaking Charge-density Wave Order in Kagome Superconductor (Rb, K)V${}_3$Sb${}_5$ by Ultrafast Pump-probe Experiments
• Interplay of $d$- and $p$-states in RbTi${}_3$Bi${}_5$ and CsTi${}_3$Bi${}_5$ flat-band kagome metals
• Coherent phonon and unconventional carriers in the magnetic kagome metal Fe${}_3$Sn${}_2$
• Interplay of superconductivity and charge-density-wave order in kagome materials
• Interlayer charge transfer induced by electronic instabilities in the natural van der Waals hetrostructure 4H${}_b$-TaS${}_2$
• Unveiling the nature of electronic transitions in RbV${}_3$Sb${}_5$ with Avoided Level Crossing $\mu$SR
• Inter-Layer Correlation of Loop Current Charge Density Wave on the Bilayer Kagomé Lattice
• Persistence of charge density wave fluctuations in the absence of long-range order in a hole-doped kagome metal
• Role of On-site and Inter-site Coulomb Interactions in KV${}_3$Sb${}_5$: A first-principles DFT+$U$+$V$ study
• Beyond kagome: $p$-bands in kagome metals
• Effective Ionic Valence and Local Magnetic Moment in Kagome Superconductors
• Charge-density waves in kagome-lattice extended Hubbard models at the van Hove filling
• Superfluid dome in the spatially modulated two-dimensional XY model