Closed-form energy spectrum obtained for PT-symmetric diatomic delta-potential superlattices, with topological states shown to vanish at critical imaginary amplitudes coinciding with PT-symmetry breaking points.
Economou, Green’s Functions in Quantum Physics, Springer Series in Solid-State Sciences (Springer Berlin Heidelberg, 2006)
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Characteristic determinant approach to the spectrum of one-dimensional $\mathcal{P}\mathcal{T}$-symmetric systems
Closed-form energy spectrum obtained for PT-symmetric diatomic delta-potential superlattices, with topological states shown to vanish at critical imaginary amplitudes coinciding with PT-symmetry breaking points.