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Journal Articles Physical Review Special Topics: Physics Education Research Year : 2022

Superradiance of optical phonons in two-dimensional materials

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Guillaume Cassabois
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Bernard Gil
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  • PersonId : 995090

Abstract

We study the superradiance of optical phonons during the two- to three-dimensional (2D-3D) crossover of the light-matter interaction in multilayers of atomic crystals. We show the emergence of a superradiant regime with a mode having a linewidth first increasing linearly with the number N of monolayers, and then decreasing as N^{−3} to zero because of the formation of stationary phonon polaritons. The linewidth culminates to values of the order of the longitudinal-transverse splitting. We estimate the extremum of the radiative efficiency for various 2D materials in the superradiant regime. We predict radiative efficiencies larger than 50% for optical phonons emitting between 6 and 165 μm. Superradiance appears as a key resource for mid- and far-infrared optophononics and advanced thermal management using multilayers of 2D materials as the active medium.
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Dates and versions

hal-03794436 , version 1 (03-10-2022)

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Guillaume Cassabois, G Fugallo, Bernard Gil. Superradiance of optical phonons in two-dimensional materials. Physical Review Special Topics: Physics Education Research, 2022, 4, pp.L032040. ⟨10.1103/PhysRevResearch.4.L032040⟩. ⟨hal-03794436⟩
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