Abstract

Dosing cesium atoms on the surface of CsV${}_{3}$Sb${}_{5}$ suppresses the charge-density wave that typically coexists with its superconductivity, paving the way to understanding the interplay between these two phenomena.

Highlights

  • Kagome lattice is an excellent playground to study the physics intertwining electron correlation and topology, owing to its peculiar band structure

  • By monitoring the temperature evolution of the charge-density wave (CDW) gap around the Mpoint, we found that the CDW can be completely killed by Cs dosing while keeping the saddle point with the V 3dxy=x2−y2 character almost pinned at the Fermi level

  • We summarize in Fig. 3(j) the TCDW estimated from the energy distribution curves (EDCs) in Figs. 3(g)–3(i) and the CDW gap size Δ for both the saddle point and shallow electron bands, plotted as a function of the volume of electron pocket at Γ

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Summary

Introduction

Kagome lattice is an excellent playground to study the physics intertwining electron correlation and topology, owing to its peculiar band structure. Single-orbital model calculations with the kagome lattice predict the formation of nearly flat band, Dirac-cone band, and saddle point van Hove singularity. When either of these bands is tuned near the Fermi level (EF), various exotic states would be realized, such as Weyl magnet [1,2,3,4,5,6,7], density wave orders [8,9,10], charge fractionalization [11,12], and superconductivity. From angle-resolved photoemission spectroscopy (ARPES) and density-functional-theory calculations [17,23,25,26,27,28], the band structure of AVS was found to be characterized by the existence of multiorbital bands apart from the simple single-orbital model: (i) kagome-lattice bands of the V 3d orbitals forming saddle points near EF at the Mpoint and Dirac-cone bands, and (ii) an Sb 5p band forming an electron pocket at the Γpoint of the surface Brillouin zone

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