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Browsing Mathematics by Author "Flach, Sergej"
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Antonopoulos, Chris G.; Skokos, Charalampos; Bountis, Tassos; Flach, Sergej
(Chaos, Solitons & Fractals, 2017-11-01)
Abstract In the study of subdiffusive wave-packet spreading in disordered Klein–Gordon (KG) nonlinear lattices, a central open question is whether the motion continues to be chaotic despite decreasing densities, or tends ...
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Kominis, Yannis; Bountis, Tassos; Flach, Sergej
(ArXiv, 2017-06-23)
We analyze the stability of a non-Hermitian coupler with respect to modulational inhomogeneous perturbations in the presence of unbalanced gain and loss. At the parity-time (PT) symmetry point the coupler is unstable. ...
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Kominis, Yannis; Bountis, Tassos; Flach, Sergej
(Scientific Reports, 2016-09-19)
We consider the asymmetric active coupler (AAC) consisting of two coupled dissimilar waveguides with gain and loss. We show that under generic conditions, not restricted by parity-time symmetry, there exist finite-power, ...