Cloning the Dirac cones of bilayer graphene to the zone center by selenium adsorption

Dirac cones can foster extraordinary electronic effects, as exemplified by the case of graphene layers. Angle-resolved photoemission reveals that adsorption of selenium (Se) vapor on bilayer graphene creates a symmetric hybrid clone of the Dirac cones at the zone center. A detailed analysis aided by first-principles calculations shows that the adsorbed layer consists of an ordered array of Se-8 molecules. The uncovered cloning mechanism illustrates a method to generate electronic features of scientific and technological interests by gentle surface modification via van der Waals adsorption.

Automated summary

This study reveals that adsorption of selenium vapor on bilayer graphene can create symmetric hybrid clone of the Dirac cones at the zone center. This mechanism provides a method to generate electronic features of scientific and technological interests through gentle surface modification via van der Waals adsorption.