Electronic nematicity without charge density waves in titanium-based kagome metal

Abstract

Layered crystalline materials that consist of transition metal atoms on a kagome network have emerged as a versatile platform to study unusual electronic phenomena. For example, in the vanadium-based kagome superconductors AV3Sb5 (where A can stand for K, Cs, or Rb) there is a parent charge density wave phase that appears to simultaneously break both the translational and the rotational symmetry of the lattice. Here, we show a contrasting situation where electronic nematic order - the breaking of rotational symmetry without the breaking of translational symmetry - can occur without a corresponding charge density wave. We use spectroscopic-imaging scanning tunneling microscopy to study the kagome metal CsTi3Bi5 that is isostructural to AV3Sb5 but with a titanium atom kagome network. CsTi3Bi5 does not exhibit any detectable charge density wave state, but comparison to density functional theory calculations reveals substantial electronic correlation effects at low energies. Comparing the amplitudes of scattering wave vectors along different directions, we discover an electronic anisotropy that breaks the six-fold symmetry of the lattice, arising from both in-plane and out-of-plane titanium-derived d orbitals. Our work uncovers the role of electronic orbitals in CsTi3Bi5, suggestive of a hexagonal analogue of the nematic bond order in Fe-based superconductors.

This is the submitted version. Final manuscript will appear in Nature Physics

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Cited by in corpus (35)

• AV${}_3$Sb${}_5$ Kagome Superconductors: Progress and Future Directions
• Charge-loop current order and Z3 nematicity mediated by bond-order fluctuations in kagome metal AV3Sb5 (A=Cs,Rb,K)
• Non-trivial band topology and orbital-selective electronic nematicity in a new titanium-based kagome superconductor
• Nanoscale visualization and spectral fingerprints of the charge order in ScV6Sn6 distinct from other kagome metals
• Electronic Landscape of Kagome Superconductors $\text{A}$V${}_3$Sb${}_5$ ($\text{A}$ = K, Rb, Cs) from Angle-Resolved Photoemission Spectroscopy
• Superconducting, topological and transport properties of kagome metals CsTi${}_3$Bi${}_5$ and RbTi${}_3$Bi${}_5$
• Tunable magnetism and electron correlation in Titanium-based Kagome metals RETi3Bi4 (RE = Yb, Pr, and Nd) by rare-earth engineering
• Van-Hove annihilation and nematic instability on a Kagome lattice
• Kagome metals
• Magnetic-coupled electronic landscape in bilayer-distorted titanium-based kagome metals
• Phonon collapse and anharmonic melting of the 3D charge-density wave in kagome metals
• Persistent flat band splitting and strong selective band renormalization in a kagome magnet thin film
• Kagome materials $A$V${}_3$Sb${}_5$ ($A$=K,Rb,Cs): pairing symmetry and pressure-tuning studies
• Topological electronic structure and electronic nematicity in candidate kagome superconductors, ATi${}_3$Bi${}_5$ (A = Rb, Cs)
• Exotic charge density waves and superconductivity on the Kagome Lattice
• Probing the pairing symmetry in kagome superconductors based on the single-particle spectrum
• Three-dimensional higher-order saddle points induced flat bands in Co-based kagome metals
• Interplay of $d$- and $p$-states in RbTi${}_3$Bi${}_5$ and CsTi${}_3$Bi${}_5$ flat-band kagome metals
• Truly local topological dynamics of driven defects in Chern insulator
• High-order van Hove singularities and nematic instability in the kagome superconductor CsTi${}_3$Bi${}_5$
• Theories for charge-driven nematicity in kagome metals
• The de Haas-van Alphen quantum oscillations in the kagome metal RbTi3Bi5
• Tuning the Intrinsic Spin Hall Effect by Charge Density Wave Order in Topological Kagome Metals
• Infrared spectroscopy study of kagome material CsTi${}_3$Bi${}_5$
• Observation of multiple flat bands and van Hove singularities in the distorted kagome metal NdTi3Bi4
• Strongly Entangled Kondo and Kagome Lattices and the Emergent Magnetic Ground State in Heavy-Fermion Kagome Metal YbV${}_6$Sn${}_6$
• Designing Topological High-Order Van Hove Singularities: Twisted Bilayer Kagomé
• Odd-parity quadrupole order and induced nonreciprocal transport in the kagome metal CsTi${}_3$Bi${}_5$ driven by quantum interference
• Weak low-temperature ferromagnetism and linear magnetoresistance in Lu${}_{0.75}$Fe${}_6$Sn${}_6$ with a disordered HfFe${}_6$Ge${}_6$-type structure
• Crystal structure, properties and pressure-induced insulator-metal transition in layered kagome chalcogenides
• Kekulé order from diffuse nesting near higher-order Van Hove points
• Diverse electronic topography in a distorted kagome metal LaTi3Bi4
• Coexisting electronic smectic liquid crystal and superconductivity in a Si square-net semimetal
• Effective Ionic Valence and Local Magnetic Moment in Kagome Superconductors
• Theory of unconventional magnetism in a Cu-based kagome metal