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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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The layer stacking in 2D Molybdenum Ditelluride (MoTe2) flakes is highly disordered, featuring mixed nanoscale domains and novel arrangements. This finding is crucial for understanding MoTe2

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Layer stacking order in 2D materials significantly impacts their functional properties, crucial for advanced electronic devices.
  • Bulk Molybdenum Ditelluride (MoTe2) exhibits two main stacking arrangements: the Td phase (ferroelectric Weyl semimetal) and the 1T' phase (higher-order topological insulator).

Purpose of the Study:

  • To investigate the layer stacking sequences in thin flakes of Molybdenum Ditelluride (MoTe2).
  • To determine if thin MoTe2 flakes adopt bulk stacking arrangements or alternative sequences.

Main Methods:

  • Utilized atomic-resolution scanning transmission electron microscopy (STEM) to directly visualize MoTe2 layer stacking.
  • Analyzed nanoscale domains and stacking arrangements within thin MoTe2 flakes.

Main Results:

  • Observed highly disordered stacking in thin MoTe2 flakes.
  • Identified nanoscale domains of both 1T' and Td phases, alongside previously unobserved stacking arrangements.
  • Attributed the observed disorder to intrinsic confinement effects influencing MoTe2's free energy.

Conclusions:

  • Thin MoTe2 flakes exhibit complex and disordered stacking sequences, deviating from bulk structures.
  • Intrinsic confinement effects play a key role in determining stacking arrangements in 2D MoTe2.
  • C-axis confinement presents a potential strategy for controlling layer stacking in other 2D materials.