Strong light-matter coupling in microcavities characterised by Rabi-splittings comparable to the Bragg stop-band widths

De Liberato, Simone and Kavokin, Alexey (2021) Strong light-matter coupling in microcavities characterised by Rabi-splittings comparable to the Bragg stop-band widths. New Journal of Physics, 23 (11), [113015]. (doi:10.1088/1367-2630/ac3260). (In Press)

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Abstract

The vacuum Rabi splitting of polaritonic eigenmodes in semiconductor microcavities scales with the square root of the oscillator strength, as predicted by the coupled oscillator model and confirmed in many experiments. We show here that the square root law is no more applicable if the Rabi splitting becomes comparable or larger than the stop-band width of the Bragg mirrors forming the cavity. Once the oscillator strength becomes large enough, the material hosting excitons hybridises with the quasi-continuum microcavity Bragg modes lying outside of the stop-band, thus forming a novel kind of polaritonic resonance. We study this physics considering both two- and three-dimensional excitonic materials embedded in the microcavity. We highlight the varied phenomenology of those polaritons and develop a theoretical understanding of their most peculiar features.

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Accepted/In Press date: 19 October 2021

Additional Information: Funding Information: Original content from this work may be used under the terms of the . Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Leading Innovative and Entrepreneur Team Introduction Program of Zhejiang Province of China Project 041020100118 & Program 2018R01002 Philip Leverhulme Prize of the Leverhulme Trust RGF\EA\181001 yes � 2021 The Author(s). Published by IOP Publishing Ltd on behalf of the Institute of Physics and Deutsche Physikalische Gesellschaft Creative Commons Attribution 4.0 licence Funding Information: AK and JC are supported by Westlake University, Project 041020100118 and Program 2018R01002 funded by Leading Innovative and Entrepreneur Team Introduction Program of Zhejiang Province of China. SDL is a Royal Society Research Fellow and was partly funded by the Philip Leverhulme Prize of the Leverhulme Trust and the RGF\EA\181001 Grant of the Royal Society. Publisher Copyright: © 2021 The Author(s). Published by IOP Publishing Ltd on behalf of the Institute of Physics and Deutsche Physikalische Gesellschaft

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