Hole doping, hybridization gap, and electronic correlation in graphene on a platinum substrate

TL;DR

This study investigates how graphene's electronic properties are altered when placed on a platinum substrate, revealing strong interactions that modify its band structure and introduce phenomena like hole doping and hybridization gaps.

Contribution

It provides a combined experimental and theoretical analysis of the electronic structure of graphene on platinum, highlighting its unique strong interaction effects compared to other metal substrates.

Findings

Graphene on platinum exhibits significant deviation in electronic structure from freestanding graphene.

Strong hybridization gap and hole doping are observed in the graphene/platinum interface.

The study establishes graphene/platinum as a model system for strong interaction with metallic substrates.

Abstract

The interaction between graphene and substrates provides a viable routes to enhance functionality of both materials. Depending on the nature of electronic interaction at the interface, the electron band structure of graphene is strongly influenced, allowing us to make use the intrinsic properties of graphene or to design additional functionality in graphene. Here, we present an angle-resolved photoemission study on the interaction between graphene and a platinum substrate. The formation of an interface between graphene and platinum leads to a strong deviation in the electronic structure of graphene not only from its freestanding form but also from the behavior observed on typical metals. The combined study on the experimental and theoretical electron band structure unveils the unique electronic properties of graphene on a platinum substrate, which singles out graphene/platinum as a model system investigating graphene on a metallic substrate with strong interaction.