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Strong Second-Harmonic Generation in Atomic Layered GaSe.

Xu Zhou, Jingxin Cheng1, Yubing Zhou

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Summary
This summary is machine-generated.

Researchers observed strong optical second-harmonic generation (SHG) in Gallium Selenide (GaSe) atomic layers. This nonlinear optical effect in GaSe is the strongest reported for two-dimensional (2D) materials, offering new insights into their properties.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Optoelectronics

Background:

  • Nonlinear optical phenomena in two-dimensional (2D) atomic layered materials are gaining significant attention.
  • These effects, including nonlinear optical edge response and valley/spin currents, expand the potential applications of 2D materials.
  • Exploring novel nonlinear effects in emerging 2D materials is crucial for technological advancement.

Purpose of the Study:

  • To report the first observation of strong optical second-harmonic generation (SHG) in monolayer Gallium Selenide (GaSe).
  • To investigate the nonlinear optical properties of GaSe under nonresonant excitation and emission conditions.
  • To utilize SHG for probing the symmetry and structural properties of GaSe atomic layers.

Main Methods:

  • Experimental observation of optical second-harmonic generation (SHG) in monolayer and bilayer GaSe.
  • Nonresonant excitation and emission spectroscopy at a wavelength of 1600 nm.
  • Polarization-dependent SHG intensity measurements and SHG mapping.
  • Analysis of lattice symmetry and stacking orders (AA, AB) in GaSe.

Main Results:

  • Monolayer GaSe exhibits exceptionally strong nonresonant SHG, surpassing other 2D atomic crystals measured to date.
  • The SHG signal from monolayer GaSe is 1-2 orders of magnitude stronger than that from MoS2 under identical excitation power.
  • Monolayer GaSe displays 3-fold lattice symmetry, correlating with its triangular shape.
  • Bilayer GaSe shows dominant AA and AB stacking orders, with edge configurations consistent across different layers.

Conclusions:

  • GaSe possesses the strongest nonlinear optical response among currently studied 2D atomic crystals.
  • SHG is a powerful tool for investigating the structural and symmetry properties of GaSe atomic layers.
  • The findings open avenues for exploring other nonlinear optical effects in GaSe and similar materials.