Polaritons in an electron gas—quasiparticles and landau effective interactions

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cam.issuedOnline2021-10-16
dc.contributor.authorBastarrachea-Magnani, MA
dc.contributor.authorThomsen, J
dc.contributor.authorCamacho-Guardian, A
dc.contributor.authorBruun, GM
dc.contributor.orcidBastarrachea-Magnani, Miguel Angel [0000-0002-1552-4101]
dc.contributor.orcidCamacho-Guardian, Arturo [0000-0001-5161-5468]
dc.contributor.orcidBruun, Georg M. [0000-0003-4764-1668]
dc.date.accessioned2021-10-18T08:51:43Z
dc.date.available2021-10-18T08:51:43Z
dc.date.issued2021-10-16
dc.date.updated2021-10-18T08:51:39Z
dc.description.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>
dc.identifier.doi10.17863/CAM.77009
dc.identifier.eissn2218-2004
dc.identifier.issn2218-2004
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/329561
dc.languageen
dc.publisherMDPI AG
dc.publisher.urlhttp://dx.doi.org/10.3390/atoms9040081
dc.subject5108 Quantum Physics
dc.subject51 Physical Sciences
dc.titlePolaritons in an electron gas—quasiparticles and landau effective interactions
dc.typeArticle
dcterms.dateAccepted2021-10-13
prism.issueIdentifier4
prism.publicationNameAtoms
prism.volume9
pubs.funder-project-idDanish National Research Foundation (DNRF156)
pubs.funder-project-idIndependent Research Fund Denmark-Natural Sciences (DFF-8021-00233B)
rioxxterms.licenseref.urihttps://creativecommons.org/licenses/by/4.0/
rioxxterms.versionVoR
rioxxterms.versionofrecord10.3390/atoms9040081
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