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Researchers discovered a rare, non-repeating helical structure in inorganic GaSeI crystals. This finding opens new avenues for exploring aperiodic helicity in low-dimensional materials.

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Area of Science:

  • Solid-state physics
  • Materials science
  • Crystallography

Background:

  • Helicity in solids typically originates from organic or molecular systems.
  • Realizing helicity in inorganic solids has been challenging due to structural constraints.

Purpose of the Study:

  • To investigate the structural motifs and helical properties of III-VI-VII van der Waals crystals.
  • To explore the potential for aperiodic helicity in inorganic low-dimensional materials.

Main Methods:

  • Crystallographic analysis of Gallium Selenide Iodide (GaSeI) and Indium Selenide Iodide (InSeI).
  • Investigation of the geometric patterns and screw axes within the crystal structures.
  • Characterization of exfoliation properties and optical activity.

Main Results:

  • GaSeI exhibits the rare Boerdijk-Coxeter helix motif, a non-repeating arrangement of face-sharing tetrahedra.
  • The modularity of 1D van der Waals lattices allows a transition from a periodic tetrahelix in InSeI to an aperiodic helix in GaSeI.
  • GaSeI crystals are non-centrosymmetric, optically active, and can be exfoliated to single chains.

Conclusions:

  • The study demonstrates the realization of aperiodic helicity in inorganic solids.
  • GaSeI presents a novel materials platform for studying the fundamental principles of helicity in low-dimensional systems.
  • This work expands the understanding of helical structures beyond traditional organic systems.