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Strain-enhanced two-photon absorption in twisted bilayer graphene.

Lianmeng Yu^1,2, Zhaoming Fu^1,3, Peizhi Yang³

¹School of Physics and Electronic Information, Yunnan Normal University, Kunming, 650500, China.

Scientific Reports

|May 4, 2025

Summary

Uniaxial strain tunes magic-angle twisted bilayer graphene

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Area of Science:

Condensed Matter Physics
Materials Science
Quantum Optics

Background:

Magic-angle twisted bilayer graphene (MA TBG) exhibits unique electronic properties due to moiré flat bands.
Two-photon absorption (TPA) is a crucial optical phenomenon in materials.
Understanding strain effects is key to controlling moiré material properties.

Purpose of the Study:

To theoretically investigate the impact of uniaxial strain on MA TBG's electronic and optical properties.
To explore strain-tunable moiré flat bands and TPA spectra.
To provide insights for strain-engineered optoelectronic devices.

Main Methods:

Utilized a low-energy continuum model for strained TBG.
Applied second-order perturbation theory to analyze TPA.
Investigated the effects of strain magnitude and direction on band structure and TPA spectra.

Main Results:

Uniaxial strain significantly modulates electronic band structure and TPA.
Strain magnitude controls flat band separation; direction induces periodic variations.
Intraband transitions dominate at higher strains, increasing TPA by an order of magnitude.
Interband transitions show spectral shifts, with smaller strain angles causing red-shifted peaks.

Conclusions:

Strain engineering offers a powerful method to tune optoelectronic properties of MA TBG.
Results provide fundamental understanding for designing novel strain-tunable moiré-based devices.
This work highlights the potential of MA TBG in advanced optical applications.