Bending Moiré in Twisted Bilayer Graphene

Area of Science:

• Condensed Matter Physics
• Materials Science

Background:

• Moiré potentials in 2D materials arise from lattice mismatches, leading to unique electronic properties.
• Strain engineering is established for tuning moiré superlattices, but the effect of out-of-plane deformation is unexplored.

Purpose of the Study:

• To investigate the impact of out-of-plane bending on the moiré superlattice of twisted bilayer graphene.
• To understand how bending deformation modifies the superlattice structure and atomic configurations.

Main Methods:

• Large-scale molecular dynamics simulations were employed.
• The evolution of the moiré superlattice under varying bending curvatures was analyzed.

Main Results:

• Out-of-plane bending induces global and local structural modifications in the moiré superlattice.
• A linear relationship between lattice displacement and bending curvature was observed.
• Local interlayer rotations were precisely regulated, and atomic stacks transformed into a relaxed superlattice structure.

Conclusions:

• Out-of-plane bending is a viable method for engineering moiré superlattices.
• This provides new avenues for controlling electronic properties in twisted 2D materials through mechanical deformation.