An unusual form of symmetry breaking in coupled microresonators with balanced optical gain and loss is now exploited to realize a novel type of optical isolator.
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Yidong, C. Asymmetry from symmetry. Nature Phys 10, 336–337 (2014). https://doi.org/10.1038/nphys2941
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DOI: https://doi.org/10.1038/nphys2941
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