Revealing the electronic band structure of trilayer graphene on SiC: An angle-resolved photoemission study
arXiv:1402.7177 · doi:10.1103/PhysRevB.88.155439
Abstract
In recent times, trilayer graphene has attracted wide attention owing to its stacking and electric field dependent electronic properties. However, a direct and well-resolved experimental visualization of its band structure has not yet been reported. In this work, we present angle resolved photoemission spectroscopy (ARPES) data which show with high resolution the electronic band structure of trilayer graphene obtained on α-SiC(0001) and β-SiC(111) via hydrogen intercalation. Electronic bands obtained from tight-binding calculations are fitted to the experimental data to extract the interatomic hopping parameters for Bernal and rhombohedral stacked trilayers. Low energy electron microscopy (LEEM) measurements demonstrate that the trilayer domains extend over areas of tens of square micrometers, suggesting the feasibility of exploiting this material in electronic and photonic devices. Furthermore, our results suggest that on SiC substrates the occurrence of rhombohedral stacked trilayer is significantly higher than in natural bulk graphite.
12 pages, 4 figures, 1 table, for Supplemental Material Refer to http://journals.aps.org/prb/supplemental/10.1103/PhysRevB.88.155439/Supplemental_PRB_final_newtitle.pdf
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