期刊
NATURE PHOTONICS
卷 15, 期 8, 页码 582-587出版社
NATURE PORTFOLIO
DOI: 10.1038/s41566-021-00820-z
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资金
- National Research Foundation of the Korean government [2019R1A2B5B03070642, 2020M3E4A1080112]
- Samsung Science and Technology Foundation [SSTF-BA1602-05]
- National Research Foundation of Korea [2020M3E4A1080112, 2019R1A2B5B03070642] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Researchers demonstrated room-temperature polaritonic parity-time-reversal symmetry by coupling exciton-polariton modes to one another in a six-fold symmetric microcavity with loss modulation. This direct coupling led to a phase transition from unbroken to broken symmetry, revealing the lowest threshold of polariton condensates in non-Hermitian degeneracies despite increasing loss.
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. As photons are intrinsically non-interactive, selection of two-photonic components is inevitable to mediate indirect coupling via near-fields. Remarkably, exciton-polaritons (the hybrid nature of excitons and photons) are directly interactive via excitonic components; however, the features of direct coupling between exciton-polariton modes have not been investigated so far. Here we demonstrate that such direct coupling can remodel conventional photonic platforms of non-Hermitian systems into polaritonic platforms with a single component; thus improving the degrees of freedom of both integration and design for the coupled system. 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 increasing loss. Researchers coupled exciton-polariton modes to one another in a six-fold symmetric microcavity with loss manipulation and observed room-temperature polaritonic parity-time-reversal symmetry.
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