Electron-phonon coupling in the charge density wave state of CsV${}_3$Sb${}_5$

Abstract

Metallic materials with kagome lattice structure are interesting because their electronic structures can host flat bands, Dirac cones, and van Hove singularities, resulting in strong electron correlations, nontrivial band topology, charge density wave (CDW), and unconventional superconductivity. Recently, kagome lattice compounds AV${}_3$Sb${}_5$ (A = K, Rb, Cs) are found to have intertwined CDW order and superconductivity. The origin of the CDW has been suggested to be purely electronic, arising from Fermi-surface instabilities of van Hove singularity (saddle point) near the M points. Here we use neutron scattering experiments to demonstrate that the CDW order in CsV${}_3$Sb${}_5$ is associated with static lattice distortion and a sudden hardening of the B3u longitudinal optical phonon mode, thus establishing that electron-phonon coupling must also play an important role in the CDW order of AV${}_3$Sb${}_5$.

References in corpus (27)

• Theory of Intertwined Orders in High Temperature Superconductors
• CsV${}_3$Sb${}_5$: a ${\mathbb{Z}}_2$ topological kagome metal with a superconducting ground state
• Discovery of unconventional chiral charge order in kagome superconductor KV3Sb5
• Roton pair density wave and unconventional strong-coupling superconductivity in a topological kagome metal
• Cascade of correlated electron states in a kagome superconductor CsV3Sb5
• Unconventional Fermi surface instabilities in the Kagome Hubbard Model
• Time-reversal symmetry-breaking charge order in a kagome superconductor
• Charge density waves and electronic properties of superconducting kagome metals
• Negative flat band magnetism in a spin-orbit coupled correlated kagome magnet
• Three-dimensional charge density wave and robust zero-bias conductance peak inside the superconducting vortex core of a kagome superconductor CsV${}_3$Sb${}_5$
• Classification of Charge Density Waves Based on Their Nature
• Observation of Unconventional Charge Density Wave without Acoustic Phonon Anomaly in Kagome Superconductors AV3Sb5 (A=Rb,Cs)
• Chiral flux phase in the Kagome superconductor AV${}_3$Sb${}_5$
• Electronic instabilities of kagome metals: saddle points and Landau theory
• Electronic Nature of Charge Density Wave and Electron-Phonon Coupling in Kagome Superconductor KV${}_3$Sb${}_5$
• Fermi surface mapping and the nature of charge density wave order in the kagome superconductor CsV${}_3$Sb${}_5$
• Complex charge density waves at Van Hove singularity on hexagonal lattices: Haldane-model phase diagram and potential realization in kagome metals ${\text{AV}}_3{\text{Sb}}_5$
• Theoretical prediction of a strongly correlated Dirac metal
• Coherent phonon spectroscopy and interlayer modulation of charge density wave order in the kagome metal CsV${}_3$Sb${}_5$
• Charge-density-wave-induced bands renormalization and energy gaps in a kagome superconductor RbV3Sb5
• Optical detection of charge-density-wave instability in the non-magnetic kagome metal KV${}_3$Sb${}_5$
• Wave vector dependent electron-phonon coupling drives charge-density-wave formation in TbTe3
• Mode-decomposition based on crystallographic symmetry in the band-unfolding method
• Geometry of the charge density wave in kagom$\acute{e}$ metal AV${}_3$Sb${}_5$
• Distinctive momentum dependent charge-density-wave gap observed in CsV${}_3$Sb${}_5$ superconductor with topological Kagome lattice
• First-principles study on the double-dome superconductivities in kagome material CsV${}_3$Sb${}_5$ under pressure
• Twofold van Hove singularity and origin of charge order in topological kagome superconductor CsV3Sb5

Cited by in corpus (60)

• Topological kagome magnets and superconductors
• Quantum states and intertwining phases in kagome materials
• Intertwined magnetism and charge density wave order in kagome FeGe
• AV${}_3$Sb${}_5$ Kagome Superconductors: Progress and Future Directions
• Coexistence of Tri-Hexagonal and Star-of-David Pattern in the Charge Density Wave of the Kagome Superconductor AV${}_3$Sb${}_5$
• A unique van Hove singularity in kagome superconductor CsV${}_{3-x}$Ta${}_x$Sb${}_5$ with enhanced superconductivity
• Competing charge-density wave instabilities in the kagome metal ScV${}_6$Sn${}_6$
• Tuning the competition between superconductivity and charge order in kagome superconductor Cs(V1-xNbx)3Sb5
• Competing superconductivity and charge-density wave in Kagome metal CsV3Sb5: evidence from their evolutions with sample thickness
• Optical spectroscopy and band structure calculations of structural phase transition in the Vanadium-based kagome metal ScV${}_6$Sn${}_6$
• Order-disorder Peierls instability in the kagome metal (Cs,Rb)V${}_3$Sb${}_5$
• Loop-current charge density wave driven by long-range Coulomb repulsion on the kagome lattice
• The effect of the interlayer ordering on the Fermi surface of Kagome superconductor CsV${}_3$Sb${}_5$ revealed by quantum oscillations
• Tunable van Hove singularity without structural instability in Kagome metal CsTi${}_3$Bi${}_5$
• Enhanced Spin-polarization via Partial Ge1-dimerization as the Driving Force of the 2$\times$2$\times$2 CDW in FeGe
• Annealing-tunable charge density wave in the kagome antiferromagnet FeGe
• Spectroscopic Evidence for a Three-Dimensional Charge Density Wave in Kagome Superconductor CsV${}_3$Sb${}_5$
• Charge fluctuations above $T_{\mathrm{CDW}}$ revealed by glasslike thermal transport in kagome metals $A$V${}_3$Sb${}_5$ ($A$ = K, Rb, Cs)
• Structural instability and charge modulations in the Kagome superconductor $A$V${}_3$Sb${}_5$
• Symmetry breaking and ascending in the magnetic 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${}_5$
• Absence of $E_{2g}$ nematic instability and dominant $A_{1g}$ response in the kagome metal CsV${}_3$Sb${}_5$
• Charge order in the kagome lattice Holstein model: A hybrid Monte Carlo study
• Electronic Correlations and Evolution of the Charge-Density Wave in the Kagome Metals $A$V${}_3$Sb${}_5$ ($A$ = K, Rb, Cs)
• Pressure-dependent Electronic Superlattice in the Kagome-Superconductor CsV${}_3$Sb${}_5$
• Pressure evolution of electron dynamics in the superconducting kagome metal CsV${}_3$Sb${}_5$
• 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
• Kagome metals
• Phonon collapse and anharmonic melting of the 3D charge-density wave in kagome metals
• Charge Dynamics of an Unconventional Three-Dimensional Charge Density Wave in Kagome FeGe
• Investigating the magneto-elastic properties in FeSn and Fe${}_3$Sn${}_2$ flat band metals
• Evolution of charge density waves from three-dimensional to quasi-two-dimensional in Kagome superconductors Cs(V${}_{1-x}{M}_x$)${}_3$Sb${}_5$ ($M$ = Nb, Ta)
• Low-Energy Electronic Structure in the Unconventional Charge-Ordered State of ScV${}_6$Sn${}_6$
• Search for orbital magnetism in the kagome superconductor $\mathrm{Cs}{\mathrm{V}}_3\mathrm{S}{\mathrm{b}}_5$ using neutron diffraction
• Observation of anomalous amplitude modes in the kagome metal CsV${}_3$Sb${}_5$
• Precursor phase with full phonon softening above the charge-density-wave phase transition in $2H$-TaSe${}_2$
• Condensation of preformed charge density waves in kagome metals
• AV${}_3$Sb${}_5$ kagome superconductors: a review with transport measurements
• Interplay between Chiral Charge Density Wave and Superconductivity in Kagome Superconductors: A Self-consistent Theoretical Analysis
• Charge order induced Dirac pockets in the nonsymmorphic crystal TaTe${}_4$
• Two-dimensional phase diagram of the charge density wave in doped CsV${}_3$Sb${}_5$
• Holstein polaron in a pseudospin-$1$ quantum spin Hall system: first and second order topological phase transitions
• Electrical and thermal transport properties of kagome metals AV${}_3$Sb${}_5$ (A=K, Rb, Cs)
• Effective minimal model and unconventional spin-singlet pairing in Kagome superconductor CsV3Sb5
• Anomalous Magnetotransport in the Paramagnetic State of a Magnetic Kagome Metal EuTi${}_3$Bi${}_4$
• Broken symmetries associated with a Kagome chiral charge order
• Photoemission Insights to Electronic Orders in Kagome Superconductor AV3Sb5
• Charge-density-wave quantum critical point under pressure in 2$H$-TaSe${}_2$
• Encoding innumerable charge density waves of FeGe into polymorphs of LiFe6Ge6
• Infrared spectroscopy study of kagome material CsTi${}_3$Bi${}_5$
• Doping Tunable CDW Phase Transition in Bulk 1T-ZrSe${}_2$
• Dichotomy of electron-phonon interactions in the delafossite PdCoO${}_2$: From weak bulk to polaronic surface coupling
• Kondo-Peierls transition with nonsymmorphic zone boundary gap formation
• Role of On-site and Inter-site Coulomb Interactions in KV${}_3$Sb${}_5$: A first-principles DFT+$U$+$V$ study
• Inter-Layer Correlation of Loop Current Charge Density Wave on the Bilayer Kagomé Lattice
• Broken inversion symmetry in the charge density wave phase in EuAl${}_4$
• Electron-electron and electron-phonon collision cross sections in CsV3Sb5
• Charge-density waves in kagome-lattice extended Hubbard models at the van Hove filling
• Theory of unconventional magnetism in a Cu-based kagome metal
• Enhanced Coupling of Superconductivity and Evolution of Gap Structure in CsV3Sb5 through Ta Doping