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Inversion-Symmetry Engineering in Layered Oxide Thin Films.

Johanna Nordlander1, Marta D Rossell2, Marco Campanini2

  • 1Department of Materials, ETH Zurich, Zurich CH-8093, Switzerland.

Nano Letters
|March 30, 2021
PubMed
Summary
This summary is machine-generated.

Researchers engineered inversion symmetry in thin films by controlling layer thickness. This allows for on-demand activation and deactivation of functionalities like piezoelectricity and nonlinear optics.

Keywords:
2D materialscomplex oxidesepitaxysecond harmonic generationsub-unit-cell engineeringultrathin films

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Area of Science:

  • Condensed-matter physics
  • Materials science
  • Oxide electronics

Background:

  • Inversion-symmetry breaking is crucial for phenomena like piezoelectricity, nonlinear optics, and spin transport.
  • Controlling inversion symmetry in materials offers a pathway to tune parity-related functionalities.
  • Quantum materials' electronic topology is influenced by inversion symmetry.

Purpose of the Study:

  • To engineer inversion symmetry at the sub-unit-cell level in ultrathin hexagonal manganite films.
  • To demonstrate on-demand activation and deactivation of inversion symmetry.
  • To utilize an inversion-symmetry-sensitive property for in situ symmetry state tracking.

Main Methods:

  • Fabrication of ultrathin hexagonal manganite films.
  • Layer-by-layer growth to control the number of half-unit-cell layers.
  • Utilizing optical second harmonic generation (SHG) as a probe for inversion symmetry.

Main Results:

  • Inversion symmetry was successfully engineered on a sub-unit-cell level.
  • An odd number of half-unit-cell layers broke inversion symmetry, while an even number maintained it.
  • Optical second harmonic generation was activated and deactivated by controlling the film's symmetry state.

Conclusions:

  • Symmetry engineering on the sub-unit-cell level provides a versatile method for controlling material properties.
  • This approach offers a new platform for the controlled activation and deactivation of symmetry-governed functionalities in epitaxial thin films.
  • The findings have implications for oxide electronics and the development of novel functional materials.