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Energetically Favored One-Dimensional Moiré Superstructure in the Pseudo-Square Lattice GdTe3.

Jieun Yeon1, Kihyun Lee1, Myeongjin Jang1

  • 1Department of Physics, Yonsei University, Seoul 03722, Korea.

ACS Nano
|August 7, 2025
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Summary

Researchers explored unconventional moiré superstructures in GdTe3 crystals, moving beyond hexagonal lattices. This work opens new avenues for understanding moiré phenomena in low-symmetry van der Waals materials.

Keywords:
1D moiréGdTe3Moiré superlatticeTEM analysispseudo-square

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Moiré engineering in layered crystals reveals diverse phenomena like superconductivity and magnetism.
  • Current research predominantly focuses on hexagonal lattices, limiting broader applications.
  • Understanding moiré phenomena in low-symmetry systems is crucial for technological advancement.

Purpose of the Study:

  • Investigate GdTe3, a pseudo-tetragonal crystal, as a novel platform for unconventional moiré phenomena.
  • Explore the creation and characterization of one-dimensional (1D) moiré superstructures in this material.
  • Expand the scope of moiré systems beyond traditional hexagonal structures.

Main Methods:

  • Vertical stacking of GdTe3 layers with controlled strain-induced distortions.
  • Transmission electron microscopy (TEM) for structural analysis, including high-resolution scanning TEM and dark-field imaging.
  • Electron energy loss spectroscopy (EELS) to probe electronic property modulations.

Main Results:

  • Energetically favorable 1D moiré superstructures were successfully realized in GdTe3.
  • Systematic examination of stacking variations across the 1D moiré structure using advanced TEM techniques.
  • Modulations in electronic properties correlated with the 1D moiré structure were observed via EELS.

Conclusions:

  • GdTe3 serves as a viable platform for exploring unconventional moiré phenomena in low-symmetry van der Waals crystals.
  • The study successfully demonstrates the creation and characterization of 1D moiré superstructures.
  • Findings broaden the field of moiré engineering beyond hexagonal twistronics.