Strong second harmonic generation in two-dimensional ferroelectric IV-monochalcogenides.

@article{RajPanday2017StrongSH,
  title={Strong second harmonic generation in two-dimensional ferroelectric IV-monochalcogenides.},
  author={Suman Raj Panday and Benjamin M. Fregoso},
  journal={Journal of physics. Condensed matter : an Institute of Physics journal},
  year={2017},
  volume={29 43},
  pages={
          43LT01
        }
}
The two-dimensional ferroelectrics GeS, GeSe, SnS and SnSe are expected to have large spontaneous in-plane electric polarization and enhanced shift-current response. Using density functional methods, we show that these materials also exhibit the largest effective second harmonic generation reported so far. It can reach magnitudes up to [Formula: see text] which is about an order of magnitude larger than that of prototypical GaAs. To rationalize this result we model the optical response with a… 

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References

SHOWING 1-10 OF 34 REFERENCES
Strong Second-Harmonic Generation in Atomic Layered GaSe.
TLDR
The first observation of strong optical second-harmonic generation (SHG) in monolayer GaSe under nonresonant excitation and emission condition is reported and provides a route toward exploring the structural information and the possibility to observe other nonlinear effects in GaSe atomic layers.
Large Bulk Photovoltaic Effect and Spontaneous Polarization of Single-Layer Monochalcogenides.
TLDR
The calculations indicate that the shift current will be largest in the visible spectrum, suggesting that these monochalcogenides may be promising for polar optoelectronic devices, and the integral of the shift-current tensor is correlated to the large spontaneous effective three-dimensional electric polarization.
Strong second harmonic generation in SiC, ZnO, GaN two-dimensional hexagonal crystals from first-principles many-body calculations.
TLDR
The second harmonic generation (SHG) intensity spectrum of SiC, ZnO, GaN two-dimensional hexagonal crystals is calculated by using a real-time first-principles approach based on Green's function theory and shows strong excitonic resonances at which the SHG intensity is about two times stronger than within the independent particle approximation.
Second-harmonic generation in GaAs: experiment versus theoretical predictions of chi(2)xyz.
TLDR
A detailed comparison with theoretical predictions reveals that calculations that include many-particle effects at the level of the "scissors" approximation can describe the overall frequency dependence of the second-harmonic susceptibility reasonably well.
Extraordinary Second Harmonic Generation in Tungsten Disulfide Monolayers
TLDR
This work investigates Second Harmonic Generation in monolayer WS2 both deposited on a SiO2/Si substrate or suspended using transmission electron microscopy grids and develops a formalism to model SHG based on the Green's function with a 2D nonlinear sheet source.
Second harmonic microscopy of monolayer MoS 2
We show that the lack of inversion symmetry in monolayer MoS2 allows strong optical second harmonic generation. Second harmonic of an 810-nm pulse is generated in a mechanically exfoliated monolayer,
Nonlinear optical response of a two-dimensional atomic crystal.
  • M. Merano
  • Physics, Medicine
    Optics letters
  • 2016
TLDR
The theory, due to its simplicity that stems from the special character of a single planar atomic lattice, is able to elucidate and explain the rich experimental details of harmonic generation from a 2D atomic crystal.
Probing symmetry properties of few-layer MoS2 and h-BN by optical second-harmonic generation.
TLDR
Values for the nonlinearity of monolayers and odd-layers of MoS2 and h-BN are reported and the variation as a function of layer thickness is compared with a model that accounts for wave propagation effects.
First principles calculation of the shift current photovoltaic effect in ferroelectrics.
TLDR
It is demonstrated that shift current is the dominant mechanism of the bulk photovoltaic effect in BaTiO(3), and the complexity of the response dependence on both external and material parameters suggests applications not only in solar energy conversion, but in photocatalysis and sensor and switch type devices as well.
Stacking order dependent second harmonic generation and topological defects in h-BN bilayers.
TLDR
A strong correlation between the interlayer stacking structures and optical and topological properties in chemically grown h-BN bilayers is reported, measured mainly by using dark-field transmission electron microscopy (DF-TEM) and optical second harmonic generation (SHG) mapping.
...
1
2
3
4
...