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Interlayer exciton mediated second harmonic generation in bilayer MoS₂.

Shivangi Shree^1,2, Delphine Lagarde¹, Laurent Lombez¹

¹Université de Toulouse, INSA-CNRS-UPS, LPCNO, 135 Avenue Rangueil, 31077, Toulouse, France.

Nature Communications

|November 26, 2021

Summary

This summary is machine-generated.

We demonstrate tunable second-harmonic generation (SHG) in bilayer molybdenum disulfide (MoS₂). By tuning laser energy and applying electric fields, SHG signals are enhanced by orders of magnitude, enabling new designs for layered materials.

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Area of Science:

Non-linear optics
Condensed matter physics
Materials science

Background:

Second-harmonic generation (SHG) is a non-linear optical process crucial for frequency conversion.
Efficient SHG typically requires crystals lacking inversion symmetry.
Transition metal dichalcogenide monolayers are known for efficient SHG.

Purpose of the Study:

To demonstrate tunable non-linear optical processes in an inversion-symmetric crystal.
To investigate the role of excitonic resonances in enhancing SHG.
To explore the impact of electric fields on SHG in bilayer MoS₂.

Main Methods:

Utilizing bilayer molybdenum disulfide (MoS₂) with strong intra- and interlayer exciton resonances.
Tuning the second-harmonic generation (SHG) signal onto these resonances via laser energy modulation.
Applying electric fields to tune interlayer exciton energies through the Stark effect.

Main Results:

SHG amplitude is enhanced by several orders of magnitude when tuned to exciton resonances.
Resonant bilayer SHG reaches amplitudes comparable to off-resonant monolayer SHG.
Applied electric fields further enhance bilayer SHG by two orders of magnitude via Stark tuning of interlayer excitons.

Conclusions:

Tunable SHG is achieved in inversion-symmetric bilayer MoS₂ by exploiting excitonic resonances.
Electric field control offers significant enhancement of SHG response.
Results pave the way for designing SHG in layered materials by tuning twist angle and material combinations.