Direct observation of zero modes in a non-Hermitian nanocavity array
- URL: http://arxiv.org/abs/2108.09672v1
- Date: Sun, 22 Aug 2021 09:19:59 GMT
- Title: Direct observation of zero modes in a non-Hermitian nanocavity array
- Authors: Flore Hentinger, Melissa Hedir, Bruno Garbin, Mathias Marconi, Li Ge,
Fabrice Raineri, Ariel Levenson, and Alejandro M. Yacomotti
- Abstract summary: 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.
- Score: 48.7576911714538
- License: http://creativecommons.org/licenses/by/4.0/
- 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 ${\pi}/2$
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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