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The energy dispersion of fermions or bosons vanishes in momentum space ifdestructive quantum interference occurs in a frustrated Kagome lattice withonly nearest-neighbour (NN) hopping. A discrete flat band (FB) without anydispersion is consequently formed, promising emergence of fractional quantumHall states (FQHS) at high temperatures. Here, we report experimentalrealization of a FB with possible nontrivial topology in an electronic Kagomelattice on a twisted multilayer silicene. The electrons are localized in theKagome lattice due to quantum destructive interference, and thus, their kineticenergy is quenched, which gives rise to a FB peak in density of states. Arobust and pronounced one-dimensional edge state has been revealed at Kagomeedge, which resides at higher energy than the FB. Our observations of the FBand the exotic edge state in electronic Kagome lattice open up the possibilitytowards the realization of fractional Chern insulators in two-dimensionalmaterials.

Realization of Flat Band with Possible Nontrivial Topology in Electronic Kagome Lattice