Nonlinear optical response of type-II Weyl fermions in two dimensions

Tamashevich, Yaraslau; Villari, Leone Di Mauro; Ornigotti, Marco

doi:10.1103/physrevb.105.195102

Cited by 7 publications

(1 citation statement)

References 48 publications

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“…This rich electronic band structure manifests itself in a variety of interesting unusual phenomenon. [6][7][8][9][10] While there has been significant theoretical work studying the behavior of WSMs, the first practical material exhibiting these properties, Tantalum Arsenide (TaAs), was only discovered in 2015. [11,12] This has led to an explosion of experimental work investigating the properties of bulk TaAs and other emerging WSMs.…”

Section: Introductionmentioning

confidence: 99%

Plasmonic Enhancement of Second Harmonic Generation in Weyl Semimetal TaAs

Yang,

Ozlu,

Peana

et al. 2024

Advanced Optical Materials

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In this work a hybrid nanoplasmonic‐Weyl Semimetal (WSM) structure is realized for the first time utilizing silver nanopatch antennas and WSM Tantalum Arsenide (TaAs). The studied hybrid WSM‐nanoplasmonic structure demonstrated a substantial, over x4.5 enhancement of the second harmonic generation (SHG) process compared to a bare TaAs film. To realize the hybrid structure while preserving TaAs properties, a scalable, non‐destructive manufacturing approach is developed that involves the fabrication of TaAs flakes from single crystalline TaAs, overgrowth of a silicon nitride overlayer, and drop‐casting of silver nanopatch antennas. The strong polarization response of both the bare flakes, along with the hybrid‐nanoplasmonic cavities demonstrates that this approach uniquely preserves the TaAs crystal structure and its optical response while providing significant enhancement of the nonlinear properties. The developed method allows leveraging the capabilities of plasmonics to control and enhance light‐matter interactions at the nanometer scale to access and engineer WSM response. This work is the first step towards high‐performance nanophotonic devices utilizing WSM topological properties.

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Section: Introductionmentioning

confidence: 99%

Plasmonic Enhancement of Second Harmonic Generation in Weyl Semimetal TaAs

Yang,

Ozlu,

Peana

et al. 2024

Advanced Optical Materials

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Nonlinear optics in graphene: theoretical background and recent advances

2023

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We present a comprehensive review of the optical response of graphene, in both the linear and nonlinear regime. This will serve as a reference for both beginners and more experienced researchers in the field. We introduce, derive, and extensively discuss the Dirac–Bloch equations framework, central to describing electron–photon interaction in nonperturbative, gapless materials. We use this model to re-derive several known results in the linear regime, such as the universal absorption law, and to describe the nonlinear interaction of ultrashort pulses with graphene. We compare the validity of the Dirac–Bloch equations model with the traditional Semiconductor-Bloch equations and point out advantages and shortcomings of the two models. Lastly, we present a cutting-edge model for describing the nonlinear optical response of graphene when bending becomes important, a situation that deeply affects the output spectra, and can provide insight to a novel, effective way to manipulate light in two-dimensional media.

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Optotwistronics of bilayer graphene

Villari

Principi²

2022

Phys. Rev. B

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Nonlinear optical response of type-II Weyl fermions in two dimensions

Cited by 7 publications

References 48 publications

Plasmonic Enhancement of Second Harmonic Generation in Weyl Semimetal TaAs

Plasmonic Enhancement of Second Harmonic Generation in Weyl Semimetal TaAs

Nonlinear optics in graphene: theoretical background and recent advances

Optotwistronics of bilayer graphene

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