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  • Letter
  • Open Access

Superradiance of optical phonons in two-dimensional materials

G. Cassabois1,*, G. Fugallo2, and B. Gil1

  • 1Laboratoire Charles Coulomb, UMR 5221 CNRS, Université de Montpellier, 34095 Montpellier, France
  • 2LTeN, UMR 6607 CNRS, Polytech Nantes, Université de Nantes, 44306 Nantes, France

  • *guillaume.cassabois@umontpellier.fr
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Phys. Rev. Research 4, L032040 – Published 12 September, 2022

DOI: https://doi.org/10.1103/PhysRevResearch.4.L032040

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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Phys. Rev. Research 4, L032040– Published 12 September, 2022
  • Received 17 January 2022
  • Revised 9 June 2022
  • Accepted 22 July 2022
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