Symmetry Breakdown in Franckeite: Spontaneous Strain, Rippling, and Interlayer Moire: Spontaneous Strain, Rippling, and Interlayer Moiré

Riccardo Frisenda, Gabriel Sanchez-Santolino, Nikos Papadopoulos, Joanna Urban, Michal Baranowski, Alessandro Surrente, Duncan K. Maude, Mar Garcia-Hernandez, Herre S.J. van der Zant, More Authors

Research output: Contribution to journalArticleScientificpeer-review

Abstract

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.

Original languageEnglish
Pages (from-to)1141-1147
JournalNano Letters
Volume20
Issue number2
DOIs
Publication statusPublished - 2020

Keywords

  • 2D material
  • anisotropic material
  • franckeite
  • interlayer moiré
  • strain

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