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Direct observation of zero modes in a non-Hermitian nanocavity array

Abstract : Zero modes are symmetry protected ones whose energy eigenvalues have zero real parts. In Hermitian arrays, they arise as a consequence of the sublattice symmetry, implying that they are dark modes. In non-Hermitian systems, that naturally emerge in gain/loss optical cavities, particle-hole symmetry prevails instead; the resulting zero modes are no longer dark but feature π/2 phase jumps between adjacent cavities. Here we report on the direct observation of zero modes in a non-Hermitian three coupled photonic crystal nanocavity array containing quantum wells. Unlike the Hermitian counterparts, the non-Hermitian zero modes can only be observed for small sublattice detuning, and they can be identified through far-field imaging and spectral filtering of the photoluminescence at selected pump locations. We explain the zero mode coalescence as a parity-time phase transition for small coupling. These zero modes are robust against coupling disorder, and can be used for laser mode engineering and photonic computing.
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Preprints, Working Papers, ...
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https://hal.archives-ouvertes.fr/hal-03326541
Contributor : Alejandro Giacomotti Connect in order to contact the contributor
Submitted on : Thursday, August 26, 2021 - 10:40:20 AM
Last modification on : Saturday, November 27, 2021 - 3:56:03 PM
Long-term archiving on: : Saturday, November 27, 2021 - 6:20:38 PM

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  • HAL Id : hal-03326541, version 1

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Flore Hentinger, Melissa Hedir, Bruno Garbin, Mathias Marconi, Li Ge, et al.. Direct observation of zero modes in a non-Hermitian nanocavity array. 2021. ⟨hal-03326541⟩

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