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Polarization Saturation in Multilayered Interfacial Ferroelectrics.

Wei Cao1, Swarup Deb2, Maayan Vizner Stern2

  • 1Department of Physical Chemistry, School of Chemistry, The Raymond and Beverly Sackler Faculty of Exact Sciences and The Sackler Center for Computational Molecular and Materials Science, Tel Aviv University, Tel Aviv, 6997801, Israel.

Advanced Materials (Deerfield Beach, Fla.)
|April 25, 2024
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Summary
This summary is machine-generated.

Two-dimensional ferroelectric materials show polarization saturation due to electronic redistribution. This phenomenon, observed in molybdenum disulfide, impacts the design of advanced electronic devices.

Keywords:
MoS2layered van der Waals structurespolarizationslidetronicstransition metal dichalcogenides

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Van der Waals materials with broken symmetries exhibit switchable electric polarization.
  • Layered ferroelectrics offer 2D building blocks for 3D ferroelectric construction.

Purpose of the Study:

  • To investigate the polarization saturation mechanism in rhombohedral molybdenum disulfide beyond a critical thickness.
  • To understand the electronic redistribution responsible for polarization saturation.

Main Methods:

  • Experimental characterization of polarization in layered molybdenum disulfide.
  • Density functional theory (DFT) calculations.
  • Self-consistent Poisson-Schrödinger calculations.

Main Results:

  • Polarization in rhombohedral molybdenum disulfide saturates beyond a critical stack thickness.
  • Saturation is driven by polarization-induced bandgap closure, enabling cross-stack charge transfer and free surface charge.
  • Free carriers reduce the polarization saturation value and critical thickness.

Conclusions:

  • The findings reveal an electronic mechanism for polarization saturation in layered ferroelectrics.
  • Layered structures' resilience to surface reconstruction is advantageous for device design.
  • Understanding polarization saturation is crucial for designing switching and conductive devices based on ferroelectric layered materials.