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Programmable SHG switching enabled by sliding ferroelectricity in bilayer MoS2
Qianyu Chen1,2, Shi-Qi Li1,2, Xiaozhendong Bao1,2
1School of Physics and Electronic Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China.
The Journal of Chemical Physics
|May 18, 2026
Summary
Sliding ferroelectricity in bilayer MoS2 enables programmable optical switching. This breakthrough allows reversible modulation of second-harmonic generation (SHG) for advanced photonic devices.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Photonics
Background:
- Programmable optical switching is crucial for next-generation integrated photonic technologies.
- Two-dimensional (2D) materials offer unique properties for advanced optical applications.
Purpose of the Study:
- To investigate the potential of sliding ferroelectricity for programmable second-harmonic generation (SHG) switching in bilayer MoS2.
- To explore the underlying mechanisms of SHG modulation by interlayer sliding and ferroelectric polarization.
Main Methods:
- First-principles calculations were employed to simulate and analyze the effects of interlayer sliding on bilayer MoS2.
- The study focused on interfacial charge redistribution, ferroelectric polarization reversal, and its impact on electronic structure and SHG response.
Main Results:
- Interlayer sliding in bilayer MoS2 induces ferroelectric polarization reversal, programmably modulating the SHG response.
- SHG tensor reconstruction showed a direct correlation between out-of-plane components and polarization reversal, enabling robust switching.
- Switching behavior was observed in polarization-resolved SHG patterns, transitioning between threefold and sixfold distributions.
Conclusions:
- Sliding ferroelectricity provides an effective mechanism for programmable SHG switching in 2D materials.
- This finding guides the design of ultrathin, integrated nonlinear photonic devices with tunable optical properties.
- The study highlights the intrinsic coupling between sliding ferroelectricity and SHG, paving the way for novel optical functionalities.
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