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Engineering interfacial polarization switching in van der Waals multilayers.

Madeline Van Winkle1, Nikita Dowlatshahi1, Nikta Khaloo1

  • 1Department of Chemistry, University of California, Berkeley, Berkeley, CA, USA.

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Summary
This summary is machine-generated.

Interlayer rotations in van der Waals heterostructures enable unprecedented control over polar domain ordering and switching dynamics. This discovery offers new avenues for designing advanced electronic materials with tunable properties.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Conventional ferroelectric materials rely on intrinsic bulk properties for polarization.
  • Van der Waals heterostructures offer a novel route to achieve polar order via interfacial effects.
  • Controlling polar domain behavior in these systems remains a challenge.

Purpose of the Study:

  • To investigate the impact of interlayer rotations on polar domain ordering and switching dynamics in van der Waals heterostructures.
  • To explore the tunability of polarization through structural modifications and external stimuli.
  • To understand the interplay between mechanical coupling and switching behavior.

Main Methods:

  • Fabrication of multilayer van der Waals heterostructures, specifically using tungsten diselenide (WSe2).
  • Operando transmission electron microscopy (TEM) to visualize and analyze polar domain structures and switching.
  • Application of uniaxial strain to induce anisotropy and study its effects on polarization.

Main Results:

  • Deliberate interlayer rotations create distinct structural polytypes with varied polar domain arrangements.
  • Tunable switching responses, including global and localized switching, were observed.
  • Uniaxial strain introduced anisotropy, leading to diverse switching behaviors, coercivities, and tunable biased responses.
  • Evidence of mechanical coupling between interfaces in trilayer structures was found.

Conclusions:

  • Interlayer rotations provide unparalleled tunability of polar order and switching dynamics in van der Waals heterostructures.
  • Strain engineering offers a powerful method to control anisotropy and switching characteristics.
  • Understanding interfacial mechanical coupling is crucial for designing advanced polar multilayer devices.