Stacking in incommensurate graphene/hexagonal-boron-nitride heterostructures based on ab initio study of interlayer interaction

Abstract

The interlayer interaction in graphene/boron-nitride heterostructures is studied using density functional theory calculations with the correction for van der Waals interactions. It is shown that the use of the experimental interlayer distance allows to describe the potential energy surface at the level of more accurate but expensive computational methods. On the other hand, it is also demonstrated that the dependence of the interlayer interaction energy on the relative in-plane position of the layers can be fitted with high accuracy by a simple expression determined by the system symmetry. The use of only two independent parameters in such an approximation suggests that various physical properties of flat graphene/boron-nitride systems are interrelated and can be expressed through these two parameters. Here we estimate some of the corresponding physical properties that can be accessed experimentally, including the correction to the period of the Moiré superstructure for the highly incommensurate ground state of graphene/boron-nitride bilayer coming from the interlayer interaction, width of stacking dislocations in slightly incommensurate systems of boron nitride on stretched graphene and shear mode frequencies for commensurate graphene/boron-nitride systems, such as a flake on a layer. We propose that the commensurate-incommensurate phase transition can be observed in boron nitride on stretched graphene and experimental measurements of the corresponding critical strain can be also used to get an insight into graphene/boron-nitride interactions.

15 pages, 4 figures

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Cited by in corpus (7)

• Flatbands and Mechanical Deformation Effects in the Moiré Superlattice of MoS${}_2$-WSe${}_2$ Heterobilayers
• Commensurate-incommensurate phase transition and a network of domain walls in bilayer graphene with a biaxially stretched layer
• Atomic-scale defects restricting structural superlubricity: Ab initio study study on the example of the twisted graphene bilayer
• Energetics and Structure of Domain Wall Networks in Minimally Twisted Bilayer Graphene under Strain
• Two phases with different domain wall networks and a reentrant phase transition in bilayer graphene under strain
• Exotic dielectric behaviors induced by pseudo-spin texture in magnetic twisted bilayer
• Universal description of potential energy surface of interlayer interaction in two-dimensional materials by first spatial Fourier harmonics