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Volume 7
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Article

Quantum Theory of Multisubband Plasmon– Phonon Coupling

by
Sofia Ribeiro
1,*,†,
Angela Vasanelli
2,
Yanko Todorov
2 and
Carlo Sirtori
2
1
Laboratoire Matériaux et Phénomènes Quantiques, UMR7162, Université de Paris, F-75013 Paris, France
2
Laboratoire de Physique de l’École Normale Supérieure, ENS, Université PSL, CNRS, Sorbonne Université, Université de Paris, F-75005 Paris, France
*
Author to whom correspondence should be addressed.
†
Current address: Joint Quantum Centre (JQC) Durham-Newcastle, Department of Physics, Rochester Building, Durham University, South Road, Durham DH1 3LE, UK.
Photonics 2020, 7(1), 19; https://doi.org/10.3390/photonics7010019
Submission received: 27 December 2019 / Revised: 16 February 2020 / Accepted: 18 February 2020 / Published: 20 February 2020
(This article belongs to the Special Issue Selected papers from “International Quantum Cascade Laser School and Workshop 2018”)
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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.
Keywords: multisubband plasmons; polarons; strong coupling regime multisubband plasmons; polarons; strong coupling regime

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MDPI and ACS Style

Ribeiro, S.; Vasanelli, A.; Todorov, Y.; Sirtori, C. Quantum Theory of Multisubband Plasmon– Phonon Coupling. Photonics 2020, 7, 19. https://doi.org/10.3390/photonics7010019

AMA Style

Ribeiro S, Vasanelli A, Todorov Y, Sirtori C. Quantum Theory of Multisubband Plasmon– Phonon Coupling. Photonics. 2020; 7(1):19. https://doi.org/10.3390/photonics7010019

Chicago/Turabian Style

Ribeiro, Sofia, Angela Vasanelli, Yanko Todorov, and Carlo Sirtori. 2020. "Quantum Theory of Multisubband Plasmon– Phonon Coupling" Photonics 7, no. 1: 19. https://doi.org/10.3390/photonics7010019

APA Style

Ribeiro, S., Vasanelli, A., Todorov, Y., & Sirtori, C. (2020). Quantum Theory of Multisubband Plasmon– Phonon Coupling. Photonics, 7(1), 19. https://doi.org/10.3390/photonics7010019

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