Band structure of twisted bilayer graphene on hexagonal boron nitride

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what happens with the inversion simmetry in this system?

AI: The inversion symmetry is broken by the hBN layer, although it is not specified whether the inversion symmetry is fully broken or only partially.


Tommaso Cea, Pierre A. Pantaleon, Francisco Guinea


The effect of an hexagonal boron nitride (hBN) layer close aligned with twisted bilayer graphene (TBG) is studied. At sufficiently low angles between twisted bilayer graphene and hBN, $\theta_{hBN} \lesssim 2^\circ$, the graphene electronic structure is strongly disturbed. The width of the low energy peak in the density of states changes from $W \sim 5 - 10$ meV for a decoupled system to $\sim 20 - 30$ meV. Spikes in the density of states due to van Hove singularities are smoothed out. We find that for a realistic combination of the twist angle in the TBG and the twist angle between the hBN and the graphene layer the system can be described using a single moir\'e unit cell.

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