Dirac exciton–polariton condensates in photonic crystal gratings

Bound states in the continuum have recently been utilized in photonic crystal gratings to achieve strong coupling and ultralow threshold condensation of exciton–polariton quasiparticles with atypical Dirac-like features in their dispersion relation. Here, we develop the single- and many-body theory...

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Bibliographic Details
Published in:Nanophotonics (Berlin, Germany) Germany), 2024-08, Vol.13 (18), p.3503-3518
Main Authors: Sigurðsson, Helgi, Nguyen, Hai Chau, Nguyen, Hai Son
Format: Article
Language:English
Subjects:
bound state in the continuum
Condensates
Coupling
Doppler effect
Elementary excitations
exciton-polariton
Excitons
Far fields
Optical properties
Optical trapping
Photonic crystals
photonic grating
Physics
polariton condensate
Polaritons
Relativistic theory
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Summary:Bound states in the continuum have recently been utilized in photonic crystal gratings to achieve strong coupling and ultralow threshold condensation of exciton–polariton quasiparticles with atypical Dirac-like features in their dispersion relation. Here, we develop the single- and many-body theory of these new effective relativistic polaritonic modes and describe their mean-field condensation dynamics facilitated by the interplay between protection from the radiative continuum and negative-mass optical trapping. Our theory accounts for tunable grating parameters giving full control over the diffractive coupling properties between guided polaritons and the radiative continuum, unexplored for polariton condensates. In particular, we discover stable cyclical condensate solutions mimicking a driven-dissipative analog of the effect characterized by coherent superposition of ballistic and trapped polariton waves. We clarify important distinctions between the polariton nearfield and farfield explaining recent experiments on the emission characteristics of these long lived nonlinear Dirac polaritons.
ISSN:2192-8606
2192-8614
2192-8614
DOI:10.1515/nanoph-2023-0834