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Theory anticipates that the in-plane px, py orbitals in a honeycomb latticelead to new and potentially useful quantum electronic phases. So far, p orbitalbands were only realized for cold atoms in optical lattices and for light andexciton-polaritons in photonic crystals. For electrons, in-plane p orbitalphysics is difficult to access since natural electronic honeycomb lattices,such as graphene and silicene, show strong s-p hybridization. Here, we reporton electronic honeycomb lattices prepared on a Cu(111) surface in a scanningtunneling microscope that, by design, show (nearly) pure orbital bands,including the p orbital flat band and Dirac cone.

p Orbital flat band and Dirac cone in the electronic honeycomb lattice