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Updated: Jun 24, 2026

Fabricating van der Waals Heterostructures with Precise Rotational Alignment
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Directionally Locked Heteroepitaxy with a Structurally Modulated van der Waals Material.

Nitish Mathur1, Guangming Cheng2, Francesc Ballester3,4

  • 1Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States.

ACS Nano
|June 23, 2026
PubMed

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Summary
This summary is machine-generated.

Lattice instabilities in van der Waals (vdW) substrates can guide the epitaxial growth of mismatched materials. This study demonstrates how a Peierls-like instability in TaCo2Te2 enables precise alignment of Co_xTe_y epilayers, expanding heterostructure design.

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Surface Science

Background:

  • Heteroepitaxy of symmetry-mismatched layers typically requires surface treatments due to weak van der Waals (vdW) bonding.
  • This limits the combination of materials for designing novel heterostructures.

Purpose of the Study:

  • To investigate how lattice instabilities in a vdW substrate influence the growth and alignment of mismatched epilayers.
  • To explore a new method for achieving precise interlayer registry in heterostructures.

Main Methods:

  • In situ heating transmission electron microscopy (TEM) to observe growth dynamics.
  • Phonon calculations to identify lattice instabilities.
  • Temperature-dependent selected area electron diffraction (SAED) to analyze structural alignment.
Keywords:
epitaxylattice instabilityscanning transmission electron microscopystructural modulationvan der Waals materials

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Main Results:

  • A Peierls-like lattice instability was observed in TaCo2Te2 around 523 K.
  • Thermally induced surface diffusion and lateral growth of Co_xTe_y epilayers were confirmed.
  • The Co_xTe_y/TaCo2Te2 heterointerface achieved directional locking, aligning lattice mismatch along the substrate's instability axis.

Conclusions:

  • Lattice instabilities in vdW substrates can be leveraged to control epitaxy and achieve precise alignment of symmetry-mismatched materials.
  • This approach enables one-dimensional lattice incommensuration and stabilizes heterointerfaces at elevated temperatures.
  • Findings expand material diversity for designing multidimensional heterostructures.