Adsorption of Na Monolayer on Graphene Covered Pt 111 Substrate

Abstract

Modification of graphene electronic properties via contact with atoms of different kind allows for designing a number of functional post silicon electronic devices. Specifically, 2D metallic layer formation over graphene is a promising approach to improving the electronic properties of graphene based systems. In this work we analyse the electronic and spin structure of graphene synthesized on Pt 111 after sodium monolayer adsorption by means of angle resolved photoemission spectroscopy and ab initio calculations. Here, we show that sodium layer formation leads to a shift of the graphene amp; 960; states towards higher binding energies, but the most intriguing property of the studied system is the appearance of a partially spin polarized Kanji symbol like feature resembling the graphene Dirac cone in the electronic structure of adsorbed sodium. Our findings reveal that this structure is caused by a strong interaction between Na orbitals and Pt 5d spin polarized states, where the graphene monolayer between them serves as a mediator of such interactio