Polaritons in an electron gas—quasiparticles and landau effective interactions
Authors
Bastarrachea-Magnani, MA
Thomsen, J
Camacho-Guardian, A
Bruun, GM
Publication Date
2021-10-16Journal Title
Atoms
ISSN
2218-2004
Publisher
MDPI AG
Volume
9
Issue
4
Language
en
Type
Article
This Version
VoR
Metadata
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Bastarrachea-Magnani, M., Thomsen, J., Camacho-Guardian, A., & Bruun, G. (2021). Polaritons in an electron gas—quasiparticles and landau effective interactions. Atoms, 9 (4) https://doi.org/10.3390/atoms9040081
Abstract
<jats:p>Two-dimensional semiconductors inside optical microcavities have emerged as a versatile platform to explore new hybrid light–matter quantum states. A strong light–matter coupling leads to the formation of exciton-polaritons, which in turn interact with the surrounding electron gas to form quasiparticles called polaron-polaritons. Here, we develop a general microscopic framework to calculate the properties of these quasiparticles, such as their energy and the interactions between them. From this, we give microscopic expressions for the parameters entering a Landau theory for the polaron-polaritons, which offers a simple yet powerful way to describe such interacting light–matter many-body systems. As an example of the application of our framework, we then use the ladder approximation to explore the properties of the polaron-polaritons. Furthermore, we show that they can be measured in a non-demolition way via the light transmission/reflection spectrum of the system. Finally, we demonstrate that the Landau effective interaction mediated by electron-hole excitations is attractive leading to red shifts of the polaron-polaritons. Our work provides a systematic framework to study exciton-polaritons in electronically doped two-dimensional materials such as novel van der Waals heterostructures.</jats:p>
Keywords
polariton, Fermi polaron, Landau theory, quasiparticle interactions
Sponsorship
Danish National Research Foundation (DNRF156)
Independent Research Fund Denmark-Natural Sciences (DFF-8021-00233B)
Identifiers
External DOI: https://doi.org/10.3390/atoms9040081
This record's URL: https://www.repository.cam.ac.uk/handle/1810/329561
Rights
Licence:
https://creativecommons.org/licenses/by/4.0/
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