Tunable van Hove singularity without structural instability in Kagome metal CsTi${}_3$Bi${}_5$

Abstract

In Kagome metal CsV${}_3$Sb${}_5$, multiple intertwined orders are accompanied by both electronic and structural instabilities. These exotic orders have attracted much recent attention, but their origins remain elusive. The newly discovered CsTi${}_3$Bi${}_5$ is a Ti-based Kagome metal to parallel CsV${}_3$Sb${}_5$. Here, we report angle-resolved photoemission experiments and first-principles calculations on pristine and Cs-doped CsTi${}_3$Bi${}_5$ samples. Our results reveal that the van Hove singularity (vHS) in CsTi${}_3$Bi${}_5$ can be tuned in a large energy range without structural instability, different from that in CsV${}_3$Sb${}_5$. As such, CsTi${}_3$Bi${}_5$ provides a complementary platform to disentangle and investigate the electronic instability with a tunable vHS in Kagome metals.

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Cited by in corpus (19)

• AV${}_3$Sb${}_5$ Kagome Superconductors: Progress and Future Directions
• Electronic nematicity without charge density waves in titanium-based kagome metal
• Superconducting, topological and transport properties of kagome metals CsTi${}_3$Bi${}_5$ and RbTi${}_3$Bi${}_5$
• On the engineering of higher-order Van Hove singularities in two dimensions
• Spin Excitations and Flat Electronic Bands in a Cr-based Kagome Superconductor
• 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
• Persistent flat band splitting and strong selective band renormalization in a kagome magnet thin film
• AV${}_3$Sb${}_5$ kagome superconductors: a review with transport measurements
• Origin of anomalous magnetotransport in kagome superconductors AV${}_3$Sb${}_5$ (A=K,Rb,Cs)
• Two-dimensional phase diagram of the charge density wave in doped CsV${}_3$Sb${}_5$
• Topological electronic structure and electronic nematicity in candidate kagome superconductors, ATi${}_3$Bi${}_5$ (A = Rb, Cs)
• Flat bands and distinct density wave orders in correlated Kagome superconductor CsCr${}_3$Sb${}_5$
• Interplay of $d$- and $p$-states in RbTi${}_3$Bi${}_5$ and CsTi${}_3$Bi${}_5$ flat-band kagome metals
• High-order van Hove singularities and nematic instability in the kagome superconductor CsTi${}_3$Bi${}_5$
• The de Haas-van Alphen quantum oscillations in the kagome metal RbTi3Bi5
• Infrared spectroscopy study of kagome material CsTi${}_3$Bi${}_5$
• Stacking-Dependent Van Hove Singularity Shifts in Three-Dimensional Charge Density Waves of Kagome Metals AV${}_3$Sb${}_5$ (A = K, Rb, Cs)
• Effect of superconductivity by Nb and V substitution in kagome CaPd5