Abstract
Anderson localization, i.e., the suppression of diffusion in lattices with a random or incommensurate disorder, is a fragile interference phenomenon that is spoiled out in the presence of dephasing effects or a fluctuating disorder. As a consequence, Anderson localization–delocalization phase transitions observed in Hermitian systems, such as in one-dimensional quasicrystals when the amplitude of the incommensurate potential is increased above a threshold, are washed out when dephasing effects are included. Here we consider localization–delocalization spectral phase transitions occurring in non-Hermitian (NH) quasicrystals with local incommensurate gain and loss and show that, contrary to the Hermitian case, the non-Hermitian phase transition is robust against dephasing effects. The results are illustrated by considering synthetic quasicrystals in photonic mesh lattices.
© 2024 Optica Publishing Group
Full Article | PDF ArticleMore Like This
Stefano Longhi
Opt. Lett. 48(23) 6251-6254 (2023)
Stefano Longhi
Opt. Lett. 47(12) 2951-2954 (2022)
Stefano Longhi
Opt. Lett. 46(12) 2872-2875 (2021)