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4 October 2022 From parity time-reversal symmetry to its breaking via whispering gallery polariton based on wide bandgap semiconductor (Conference Presentation)
Hyun Gyu Song, Yong-Hoon Cho
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Proceedings Volume PC12201, UV and Higher Energy Photonics: From Materials to Applications 2022; PC1220101 (2022) https://doi.org/10.1117/12.2633187
Event: SPIE Nanoscience + Engineering, 2022, San Diego, California, United States
Abstract
Parity–time reversal symmetry (PT-symmetry) in non-Hermitian systems realizes spontaneous symmetry breaking, thereby leading to counterintuitive phenomena. A coupled system with antisymmetric gain/loss profiles is required to introduce PT-symmetry into photonics. Remarkably, exciton-polaritons (the hybrid nature of excitons and photons) are directly interactive via excitonic components. Here we demonstrate that such direct coupling can remodel conventional photonic platforms of non-Hermitian systems into polaritonic platforms with a single component. We focused on the sixfold-symmetric microcavity to exploit degenerated photonic modes. By employing direct coupling with loss modulation, we observed room-temperature polaritonic PT symmetry with a phase transition from unbroken to broken, revealing the lowest threshold of polariton condensates in non-Hermitian degeneracies despite the increasing loss.
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Hyun Gyu Song and Yong-Hoon Cho "From parity time-reversal symmetry to its breaking via whispering gallery polariton based on wide bandgap semiconductor (Conference Presentation)", Proc. SPIE PC12201, UV and Higher Energy Photonics: From Materials to Applications 2022, PC1220101 (4 October 2022); https://doi.org/10.1117/12.2633187
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KEYWORDS
Polaritons
Wide bandgap semiconductors
Photonic crystals
Excitons
Optical microcavities
Photon polarization
Plasmonics
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