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Article Dans Une Revue Physical Review B Année : 2023

Epitaxial two-dimensional membranes under intrinsic and extrinsic strains

Résumé

Two-dimensional (2D) materials naturally form moiré patterns with other crystalline layers, such as other 2D materials or the surface of a substrate. These patterns add a nanoscale characteristic length in the form of a superlattice: the moiré wavelength. Understanding the origin and characteristics of these patterns is crucial to design and interpret moiré-induced physical properties. Here, we use a mixed continuum mechanics plus atomistic model to study two experimentally relevant epitaxial 2D materials—graphene on Ir(111) and MoS2 on Au(111)—under extrinsic and intrinsic strains. We consider three different scenarios that substantially affect the lattice constant of the 2D materials, the wavelength, and the corrugation of the moiré pattern. (i) Under the influence of the interaction with the substrate, bending energy produces nontrivial variations of the moiré properties, even when the strain is small. (ii) When locked on a progressively strained substrate via the valleys of the moiré, the membranes' nanorippling amplitude goes through several jumps related to relatively smaller jumps in the interatomic distance of the 2D materials. (iii) Finally, with an increasing zero-deformation value of this interatomic distance (possibly controllable with temperature or illumination in experiments), the moiré wavelength can either increase or decrease.

Dates et versions

hal-04336353 , version 1 (11-12-2023)

Identifiants

Citer

Nicolas Rougemaille, Johann Coraux. Epitaxial two-dimensional membranes under intrinsic and extrinsic strains. Physical Review B, 2023, 108 (23), pp.235415. ⟨10.1103/PhysRevB.108.235415⟩. ⟨hal-04336353⟩

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