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Two-dimensional ferroelectric materials like GeS, GeSe, SnS, and SnSe exhibit significant electric polarization and shift-current effects. These properties lead to exceptionally large second harmonic generation, making them ideal for advanced optoelectronic devices.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Optoelectronics

Background:

  • Two-dimensional (2D) ferroelectrics are materials with spontaneous electric polarization.
  • GeS, GeSe, SnS, and SnSe are 2D materials with potential for unique electronic and optical properties.
  • Enhanced shift-current response is desirable for non-linear optical applications.

Purpose of the Study:

  • To investigate the second harmonic generation (SHG) properties of 2D ferroelectrics GeS, GeSe, SnS, and SnSe.
  • To compare the SHG response of these materials with existing benchmarks like GaAs.
  • To understand the relationship between shift-current response and SHG in these materials.

Main Methods:

  • Density functional theory (DFT) calculations were employed to model the electronic and optical properties.
  • A one-dimensional two-band model was used to analyze the optical response along the polarization direction.
  • Effective second harmonic generation coefficients were calculated.

Main Results:

  • GeS, GeSe, SnS, and SnSe exhibit the largest effective second harmonic generation (SHG) reported to date.
  • The SHG magnitudes can reach up to [Formula: see text], an order of magnitude greater than GaAs.
  • A direct proportionality was found between the shift-current response and the SHG tensor within the model.

Conclusions:

  • The investigated 2D ferroelectrics possess exceptional SHG properties.
  • Their large shift-current and SHG responses make them highly promising for non-linear optical and optoelectronic applications.
  • These materials offer a new avenue for developing advanced photonic devices.