Origin of the energy bandgap in epitaxial graphene
S.Y. Zhou, D.A. Siegel, A.V. Fedorov, F. El Gabaly, A. K. Schmid, A.H., Castro Neto, A. Lanzara
TL;DR
This study investigates how quantum confinement influences the energy bandgap in epitaxial graphene, revealing that it alone does not explain the large gaps observed, through combined LEEM and ARPES analysis.
Contribution
It provides experimental evidence that quantum confinement is not the sole factor determining the large bandgap in epitaxial graphene.
Findings
Quantum confinement does not fully explain the large bandgap.
A direct correlation between terrace size and gap size was observed.
Other mechanisms besides quantum confinement influence the bandgap.
Abstract
We studied the effect of quantum confinement on the size of the band gap in single layer epitaxial graphene. Samples with different graphene terrace sizes are studied by using low energy electron microscopy (LEEM) and angle-resolved photoemission spectroscopy (ARPES). The direct correlation between the terrace size extracted from LEEM and the gap size extracted from ARPES shows that quantum confinement alone cannot account for the large gap observed in epitaxial graphene samples.
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