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

Materials Science