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Updated: Feb 13, 2026

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
Published on: August 5, 2013
Defect States Emerging from a Non-Hermitian Flatband of Photonic Zero Modes
Bingkun Qi1,2, Lingxuan Zhang1,3, Li Ge1,2
1Department of Engineering Science and Physics, College of Staten Island, CUNY, Staten Island, New York 10314, USA.
Abstract:
We show the existence of a flatband consisting of photonic zero modes in a gain and loss modulated lattice system as a result of the underlying non-Hermitian particle-hole symmetry. This general finding explains the previous observation in parity-time symmetric systems where non-Hermitian particle-hole symmetry is hidden. We further discuss the defect states in these systems, whose emergence can be viewed as an unconventional alignment of a pseudospin under the influence of a complex-valued pseudomagnetic field. These defect states also behave as a chain with two types of links, one rigid in a unit cell and one soft between unit cells, as the defect states become increasingly localized with the gain and loss strength.
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