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Two phases with different domain wall networks and a reentrant phase transition in bilayer graphene under strain

The analytical two-chain Frenkel-Kontorova model is used to describe domain wall networks in bilayer graphene upon biaxial stretching of one of the layers. We show that the commensurate-incommensurate phase transition leading to formation of a regular triangular domain wall network at the relative biaxial elongation of $3.0\cdot 10^{-3}$ is followed by the transition to another incommensurate phase with a striped network at the elongation of $3.7\cdot 10^{-3}$. The reentrant transition to the phase with a triangular domain wall network is predicted for the elongation $\sim10^{-2}$.