Realizing Kagome Band Structure in Two-Dimensional Kagome Surface States of $RV_{6}Sn_{6}$ ($R$=Gd,Ho)

TL;DR

This study uses angle-resolved photoemission to identify and characterize two-dimensional kagome surface states in $RV_{6}Sn_{6}$ compounds, revealing key features like Dirac cones and flat bands, thus providing a new platform for kagome physics research.

Contribution

First experimental observation of 2D kagome surface states in $RV_{6}Sn_{6}$, differentiating bulk and surface states with real-space resolution.

Findings

Identification of Dirac cone, saddle point, and flat bands in kagome surface states

Differentiation of bulk and surface states using real-space resolution

Establishment of 2D kagome surface states as a platform for studying kagome physics

Abstract

We report angle resolved photoemission experiments on a newly discovered family of kagome metals $RV_{6}Sn_{6}$ ($R$=Gd, Ho). Intrinsic bulk states and surface states of the vanadium kagome layer are differentiated from those of other atomic sublattices by the real-space resolution of the measurements with a small beam spot. Characteristic Dirac cone, saddle point and flat bands of the kagome lattice are observed. Our results establish the two-dimensional (2D) kagome surface states as a new platform to investigate the intrinsic kagome physics.