Symmetry Breakdown in Franckeite: Spontaneous Strain, Rippling and Interlayer Moiré
2019
Franckeite is a naturally occurring layered mineral with a structure
composed of alternating stacks of SnS2-like and PbS-like layers. Although
this superlattice is composed of a sequence of isotropic two-dimensional
layers, it exhibits a spontaneous rippling that makes the material structurally
anisotropic. We demonstrate that this rippling comes hand in hand with an
inhomogeneous in-plane strain profile and anisotropic electrical, vibrational
and optical properties. We argue that this symmetry breakdown results from a
spatial modulation of the van der Waals interaction between layers due to the
SnS2-like and PbS-like lattices incommensurability.
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