An unconventional platform for two-dimensional Kagome flat bands on semiconductor surfaces

Abstract

In condensed matter physics, the Kagome lattice and its inherent flat bands have attracted considerable attention for their potential to host a variety of exotic physical phenomena. Despite extensive efforts to fabricate thin films of Kagome materials aimed at modulating the flat bands through electrostatic gating or strain manipulation, progress has been limited. Here, we report the observation of a novel $d$-orbital hybridized Kagome-derived flat band in Ag/Si(111) $\sqrt{3}\times \sqrt{3}$ as revealed by angle-resolved photoemission spectroscopy. Our findings indicate that silver atoms on a silicon substrate form a Kagome-like structure, where a delicate balance in the hopping parameters of the in-plane $d$-orbitals leads to destructive interference, resulting in a flat band. These results not only introduce a new platform for Kagome physics but also illuminate the potential for integrating metal-semiconductor interfaces into Kagome-related research, thereby opening a new avenue for exploring ideal two-dimensional Kagome systems.

arXiv comment7 pages, 4 figures

References in corpus (14)

• Massive Dirac fermions in a ferromagnetic kagome metal
• Dirac fermions and flat bands in the ideal kagome metal FeSn
• Topological kagome magnets and superconductors
• Negative flat band magnetism in a spin-orbit coupled correlated kagome magnet
• Topological flat bands in frustrated kagome lattice CoSn
• Classification of flat bands according to the band-crossing singularity of Bloch wave functions
• Intertwined magnetism and charge density wave order in kagome FeGe
• Observation of topological flat bands in the kagome semiconductor Nb${}_3$Cl${}_8$
• Charge-order-assisted topological surface states and flat bands in the kagome superconductor CsV${}_3$Sb${}_5$
• Realizing Kagome Band Structure in Two-Dimensional Kagome Surface States of $R{V}_{6}S{n}_6$ ($R$=Gd,Ho)
• Electronic correlations and flattened band in magnetic Weyl semimetal candidate Co3Sn2S2
• A flat band-induced correlated kagome metal
• Realization of robust boundary modes and non-contractible loop states in photonic Kagome lattices
• Non-Abelian inverse Anderson transitions

Cited by in corpus (2)

• Kagome metals
• Nonlinear optical response in kagome lattice with inversion symmetry breaking