Layer-dependent topological phase in a two-dimensional quasicrystal and approximant.

ABSTRACT: The electronic and topological properties of materials are derived from the interplay between crystalline symmetry and dimensionality. Simultaneously introducing "forbidden" symmetries via quasiperiodic ordering with low dimensionality into a material system promises the emergence of new physical phenomena. Here, we isolate a two-dimensional (2D) chalcogenide quasicrystal and approximant, and investigate their electronic and topological properties. The 2D layers of the materials with a composition close to Ta_1.6Te, derived from a layered transition metal dichalcogenide, are isolated with standard exfoliation techniques, and investigated with electron diffraction and atomic resolution scanning transmission electron microscopy. Density functional theory calculations and symmetry a

SUBMITTER: Cain JD 

PROVIDER: S-EPMC7584993 | biostudies-literature | 2020 Oct

REPOSITORIES: biostudies-literature