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Strain-Induced Moiré Polarization Vortices in Twisted-Multilayer WSe2.

Jeroen J M Sangers1, Abel Brokkelkamp1, Sonia Conesa-Boj1

  • 1Kavli Institute of Nanoscience, Delft University of Technology, Delft, 2628 CJ, The Netherlands.

Small (Weinheim an Der Bergstrasse, Germany)
|May 20, 2025
PubMed
Summary

Nanoscale strain, not just twisting, controls polarization vortices in multilayer WSe2. This discovery offers new ways to engineer 2D materials for advanced electronics.

Keywords:
in‐plane polarizationmoiré superlatticesstrain‐induced polarization texturestwisted multilayer WSe2

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Moiré superlattices in 2D van der Waals (vdW) materials allow for engineered local polarization and electrostatic potentials.
  • Polarization vortices are known in bilayer transition metal dichalcogenides (TMDs), but their formation in multilayers is not well understood.

Purpose of the Study:

  • To investigate the mechanisms behind polarization vortex formation in multi-twisted, small-angle multilayer WSe2.
  • To determine the roles of twist angle and nanoscale strain in controlling these polarization textures.

Main Methods:

  • Utilized 4D scanning transmission electron microscopy (4D-STEM) with an electron microscope pixel array detector (EMPAD).
  • Spatially resolved local electrostatic potential variations and strain distributions with nanometer precision.

Main Results:

  • Polarization vortices exclusively emerge in regions with significant nanoscale strain.
  • Demonstrated a direct interplay between lattice reconstruction and Moiré-induced polarization textures in twisted multilayers.
  • Identified nanoscale strain fields, rather than twist alone, as the primary drivers for vortex emergence and stability.

Conclusions:

  • Strain is a critical parameter for controlling Moiré-induced polarization in multilayer vdW materials.
  • Findings provide new avenues for strain-engineered 2D vdW materials, chiral dipole textures, and low-power electronic/optoelectronic devices.