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Quantum Theory of Multisubband Plasmon- Phonon Coupling

Abstract : We present a theoretical description of the coupling between longitudinal optical phonons and collective excitations of a two-dimensional electron gas. By diagonalizing the Hamiltonian of the system, including Coulomb electron-electron and Fröhlich interactions, we observe the formation of multisubband polarons, mixed states partially phonon and partially multisubband plasmon, characterized by a coupling energy which is a significant fraction, up to ∼ 40%, of the phonon energy. We demonstrate that multisubband plasmons and longitudinal optical phonons are in the ultra-strong coupling regime in several III-V and II-VI material systems.
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Sofia Ribeiro, Angela Vasanelli, Yanko Todorov, Carlo Sirtori. Quantum Theory of Multisubband Plasmon- Phonon Coupling. Photonics, MDPI, 2020, 7 (1), pp.19. ⟨10.3390/photonics7010019⟩. ⟨hal-02553732⟩

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