Synthesis and characterization of atomically-thin graphite films on a silicon carbide substrate

TL;DR

This study demonstrates the synthesis of atomically-thin graphite films on silicon carbide, achieving high-quality, single-crystalline layers down to one graphene sheet, characterized by advanced surface analysis techniques.

Contribution

It presents a detailed method for growing and characterizing ultra-thin graphite films on SiC, including the first comprehensive analysis of their electronic structure at this scale.

Findings

Successful growth of single-crystalline graphite films down to one layer

High-resolution photoemission reveals sharp, momentum-resolved electronic states

Growth monitored and confirmed using multiple surface characterization techniques

Abstract

This paper reports the synthesis and detailed characterization of graphite thin films produced by thermal decomposition of the (0001) face of a 6H-SiC wafer, demonstrating the successful growth of single crystalline films down to approximately one graphene layer. The growth and characterization were carried out in ultrahigh vacuum (UHV) conditions. The growth process and sample quality were monitored by low-energy electron diffraction, and the thickness of the sample was determined by core level x-ray photoelectron spectroscopy. High-resolution angle-resolved photoemission spectroscopy shows constant energy map patterns, which are very sharp and fully momentum-resolved, but nonetheless not resolution limited. We discuss the implications of this observation in connection with scanning electron microscopy data, as well as with previous studies.