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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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2D quasi-layered material with domino structure.

Haihui Lan1,2, Luyang Wang3, Runze He1

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Researchers discovered quasi-layered domino-structured (QLDS) materials, a new class bridging layered and non-layered 2D materials. These QLDS materials exhibit unique interlayer forces and significant anisotropy, enabling enhanced nonlinear optical properties.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Two-dimensional (2D) materials are classified as layered or non-layered based on interlayer coupling strength.
  • Layered materials are linked by van der Waals (vdW) forces or covalent bonds, typically orthogonal to the growth plane.
  • A gap exists between traditional layered and non-layered material classifications.

Purpose of the Study:

  • To introduce and characterize a novel class of materials termed quasi-layered domino-structured (QLDS) materials.
  • To investigate the unique interlayer forces and structural properties of QLDS materials.
  • To explore the potential applications arising from the distinct characteristics of QLDS materials.

Main Methods:

  • Experimental synthesis and characterization of QLDS materials (e.g., QLDS-GaTe).
  • Analysis of interlayer forces, considering a synergistic blend of vdW forces and covalent bonds.
  • Measurement of lattice constant contraction and assessment of material anisotropy.

Main Results:

  • QLDS materials bridge the gap between layered and non-layered materials.
  • The force orthogonal to the 2D QLDS growth plane is a unique blend of vdW and covalent forces, not perpendicular to the plane.
  • Observed lattice constant contraction of 7.7% and significant anisotropy.
  • Achieved remarkable second harmonic generation (SHG) susceptibility of 394.3 pm/V.

Conclusions:

  • QLDS materials represent a new paradigm in 2D material classification.
  • The unique interlayer bonding in QLDS materials leads to pronounced anisotropic properties.
  • These findings open avenues for applications in nonlinear optics, sensors, and catalysis.