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Updated: Jun 21, 2025

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Published on: June 28, 2016
Non-Hermitian Delocalization in a Two-Dimensional Photonic Quasicrystal
Zhaoyang Zhang1, Shun Liang1, Ismaël Septembre2
1Key Laboratory for Physical Electronics and Devices of the Ministry of Education & Shaanxi Key Lab of Information Photonic Technique, School of Electronic Science and Engineering, Faculty of Electronics and Information, <a href="https://ror.org/017zhmm22">Xi'an Jiaotong University</a>, Xi'an 710049, China.
Abstract:
Theoretical and experimental studies suggest that both Hermitian and non-Hermitian quasicrystals show localization due to the fractal spectrum and to the transition to diffusive bands via exceptional points, respectively. Here, we present an experimental study of a dodecagonal photonic quasicrystal based on electromagnetically induced transparency in a Rb vapor cell. First, we observe the suppression of the wave packet expansion in the Hermitian case. We then discover a new regime, where increasing the non-Hermiticity leads to delocalization, demonstrating that the behavior in non-Hermitian quasicrystals is richer than previously thought.
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