2 papers
math-ph2026
Spectral topology and edge modes for one-dimensional non-Hermitian photonic crystals
Junshan Lin, Hai Zhang
This work investigates edge modes in non-Hermitian photonic crystals with broken spectral reciprocity. In such systems, the spectra of the underlying operators generally form close…
math.AP2023
A rigorous theory on electromagnetic diffraction by a planar aperture in a perfectly conducting screen
Ying Liang, Hai Zhang
In this paper, we revisit the classic problem of diffraction of electromagnetic waves by an aperture in a perfectly conducting plane. We formulate the diffraction problem using a b…