Going around an exceptional point in a full circle can be a non-adiabatic, asymmetric process. This surprising prediction is now confirmed by two separate experiments.
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References
Doppler, J. et al. Nature http://doi.org/bm33 (2016).
Xu, H. et al. Nature http://doi.org/bm4r (2016).
Milburn, T. J. et al. Phys. Rev. A 92, 052124 (2015).
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Heiss, D. Circling exceptional points. Nature Phys 12, 823–824 (2016). https://doi.org/10.1038/nphys3864
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DOI: https://doi.org/10.1038/nphys3864
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