Ab initio quasiparticle bandstructure of ABA and ABC-stacked graphene trilayers

Abstract

We obtain the quasiparticle band structure of ABA and ABC-stacked graphene trilayers through ab initio density functional theory (DFT) and many-body quasiparticle calculations within the GW approximation. To interpret our results, we fit the DFT and GW $\pi$ bands to a low energy tight-binding model, which is found to reproduce very well the observed features near the K point. The values of the extracted hopping parameters are reported and compared with available theoretical and experimental data. For both stackings, the self energy corrections lead to a renormalization of the Fermi velocity, an effect also observed in previous calculations on monolayer graphene. They also increase the separation between the higher energy bands, which is proportional to the nearest neighbor interlayer hopping parameter ${\gamma }_1$. Both features are brought to closer agreement with experiment through the self energy corrections. Finally, other effects, such as trigonal warping, electron-hole asymmetry and energy gaps are discussed in terms of the associated parameters.

5 pages, 3 figures

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• Photocurrent generation at ABA/ABC lateral junction in tri-layer graphene photodetector
• Layer breathing and shear modes in multilayer graphene: A DFT-vdW study
• Strong gate-tunability of flat bands in bilayer graphene due to moiré encapsulation between hBN monolayers
• Electronic and structural properties of vacancies and hydrogen adsorbates on trilayer graphene
• Quasiparticle renormalization in ABC graphene trilayers