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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Quantum Phenomena

Background:

  • Complex oxide heterointerfaces and van der Waals heterostructures are key platforms for quantum phenomena.
  • The synergy between these material classes remains largely unexplored.
  • Emergent functionalities arise from the unique interplay of material properties.

Purpose of the Study:

  • To investigate the synergistic effects between complex oxide heterointerfaces and van der Waals heterostructures.
  • To explore novel nonlinear optical phenomena at material interfaces.
  • To develop new strategies for nanoscale reconfigurable optical applications.

Main Methods:

  • Fabrication of heterostructures combining monolayer MoS2 and ferroelectric oxide thin films.
  • Nonlinear optical measurements, specifically second harmonic generation (SHG).
  • Density functional theory (DFT) calculations to understand interfacial effects.

Main Results:

  • An unconventional nonlinear optical filtering effect was observed at the MoS2-ferroelectric oxide interface.
  • The second harmonic generation response is modulated by ferroelectric domain wall chirality and polar domains.
  • Interfacial polar alignment, not charge, spin, or lattice coupling, mediates the observed effect.

Conclusions:

  • Polar symmetry plays a crucial role in tailoring optical responses at hybrid interfaces.
  • This work establishes a new material strategy for designing nanoscale reconfigurable optical devices.
  • The findings open avenues for exploring novel quantum phenomena in hybrid heterostructures.