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Browsing School of Science and Technology (2015-2019) by Author "a21d473b-733d-4dfa-ba8b-0a0028631b96"

Now showing items 1-3 of 3

Analyzing Chaos in Higher Order Disordered Quartic-Sextic Klein-Gordon Lattices Using q-Statistics

Antonopoulos, Chris G.; Skokos, Charalampos; Bountis, Tassos; Flach, Sergej (arXiv, 2018-03-19)

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 to become ...
The Asymmetric Active Coupler: Stable Nonlinear Supermodes and Directed Transport

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, ...
Stability through asymmetry: Modulationally stable nonlinear supermodes of asymmetric non-Hermitian optical couplers

Kominis, Yannis; Bountis, Tassos; Flach, Sergej (Physical Review A, 2017-06-21)

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. Suitable ...