Low-energy optical properties of the non-magnetic kagome metal CsV${}_3$Sb${}_5$

Abstract

Temperature-dependent reflectivity measurements on the kagome metal CsV${}_3$Sb${}_5$ in a broad frequency range of $50-20000$ cm${}^{-1}$ down to $T$=10 K are reported. The charge-density wave (CDW) formed below $T_{\mathrm{CDW}}$ = 94 K manifests itself in a prominent spectral-weight transfer from low to higher energy regions. The CDW gap of 60-75 meV is observed at the lowest temperature and shows significant deviations from an isotropic BCS-type mean-field behavior. Absorption peaks appear at frequencies as low as 200 cm${}^{-1}$ and can be identified with interband transitions according to density-functional calculations. The change in the interband absorption compared to KV${}_3$Sb${}_5$ reflects the inversion of band saddle points between the K and Cs compounds. Additionally, a broader and strongly temperature-dependent absorption feature is observed below 1000 cm${}^{-1}$ and assigned to a displaced Drude peak. It reflects localization effects on charge carriers.

9 pages, 7 figures

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Cited by in corpus (49)

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• Competition between charge-density-wave and superconductivity in the kagome metal RbV3Sb5
• High Resolution Polar Kerr Effect Studies of CsV${}_3$Sb${}_5$: Tests for Time Reversal Symmetry Breaking Below the Charge Order Transition
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• Tuning the van Hove singularities in AV${}_3$Sb${}_5$ (A = K, Rb, Cs) via pressure and doping
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• Order-disorder Peierls instability in the kagome metal (Cs,Rb)V${}_3$Sb${}_5$
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• Optical study of RbV${}_3$Sb${}_5$: Multiple density-wave gaps and phonon anomalies
• Unconventional Optical Rotation in the Charge Ordered State of Kagome Metal CsV3Sb5
• Dynamical Study of the Origin of the Charge Density Wave in $A$V${}_3$Sb${}_5$ ($A=$K, Rb, Cs) Compounds
• Tuning charge-density wave order and superconductivity in the kagome metals KV${}_3$Sb${}_{5-x}$Sn${}_x$ and RbV${}_3$Sb${}_{5-x}$Sn${}_x$
• Electronic properties of correlated kagomé metals AV${}_3$Sb${}_5$(A = K, Rb, Cs): A perspective
• Displaced Drude peak and bad metal from the interaction with slow fluctuations
• Intriguing Low-Temperature Phase in the Antiferromagnetic Kagome Metal FeGe
• Distinct band reconstructions in kagome superconductor CsV${}_3$Sb${}_5$
• Effects of Nb Doping on the Charge-Density Wave and Electronic Correlations in the Kagome Metal Cs(V${}_{1-x}$Nb${}_x$)${}_3$Sb${}_5$
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• How correlations change the magnetic structure factor of the kagome Hubbard model
• Magneto-optical detection of topological contributions to the anomalous Hall effect in a kagome ferromagnet
• Electronic Correlations and Evolution of the Charge-Density Wave in the Kagome Metals $A$V${}_3$Sb${}_5$ ($A$ = K, Rb, Cs)
• FeGe as a building block for the kagome 1:1, 1:6:6, and 1:3:5 families: hidden d-orbital decoupling of flat band sectors, effective models and interaction Hamiltonians
• Pressure evolution of electron dynamics in the superconducting kagome metal CsV${}_3$Sb${}_5$
• Kagome metals
• Kagome Materials I: SG 191, ScV${}_6$Sn${}_6$. Flat Phonon Soft Modes and Unconventional CDW Formation: Microscopic and Effective Theory
• Evidence of a distinct collective mode in Kagome superconductors
• Observation of anomalous amplitude modes in the kagome metal CsV${}_3$Sb${}_5$
• Signatures of van Hove singularities in the anisotropic in-plane optical conductivity of the topological semimetal Nb${}_3$SiTe${}_6$
• 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${}_2$
• Topological Superconducting States and Quasiparticle Transport on Kagome Lattice
• Interplay of superconductivity and charge-density-wave order in kagome materials
• Evidence for reduced periodic lattice distortion within the Sb-terminated surface layer of the kagome metal CsV${}_3$Sb${}_5$
• Coherent Phonon Pairs and Rotational Symmetry Breaking of Charge Density Wave Order in the Kagome Superconductor CsV${}_3$Sb${}_5$
• Interplay of Charge Density Wave and Magnetism on the Kagomé Lattice
• Infrared spectroscopy study of kagome material CsTi${}_3$Bi${}_5$
• Josephson diodes induced by the loop current states
• Interlayer charge transfer induced by electronic instabilities in the natural van der Waals hetrostructure 4H${}_b$-TaS${}_2$
• Fidelity and variability in the interlayer electronic structure of the kagome superconductor CsV3Sb5
• Displaced Drude peak from $\pi$-ton vertex corrections
• Inter-Layer Correlation of Loop Current Charge Density Wave on the Bilayer Kagomé Lattice
• Hexagonal-to-base-centered-orthorhombic $4Q$ charge density wave order in kagome metals KV${}_3$Sb${}_5$, RbV${}_3$Sb${}_5$, and CsV${}_3$Sb${}_5$
• Analytical expression for $\pi$-ton vertex contributions to the optical conductivity
• Superfluid dome in the spatially modulated two-dimensional XY model
• Charge-density waves in kagome-lattice extended Hubbard models at the van Hove filling