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Browsing 01.NU Schools by Author "d6dc9986-e50b-438b-a45e-361aac72efbc"

Now showing items 1-8 of 8

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, ...
Controllable Asymmetric Phase-Locked States of the Fundamental Active Photonic Dimer

Kominis, Yannis; Kovanis, Vassilios; Bountis, Tassos (arXiv, 2018-03-07)

Coupled semiconductor lasers are systems possessing complex dynamics that are interesting for numerous applications in photonics. In this work, we investigate the existence and the stability of asymmetric phase-locked ...
The effect of long–range interactions on the dynamics and statistics of 1D Hamiltonian lattices with on–site potential

Christodoulidi, H.; Bountis, Tassos; Drossos, L. (arXiv, 2018-04)

We examine the role of long–range interactions on the dynamical and statistical properties of two 1D lattices with on–site potentials that are known to support discrete breathers: the Klein–Gordon (KG) lattice which ...
Homoclinic Points of 2-D and 4-D Maps via the Parametrization Method

Anastassiou, Stavros; Bountis, Tassos; B¨acker, Arnd (arXiv, 2017-09)

An interesting problem in solid state physics is to compute discrete breather solutions in N coupled 1–dimensional Hamiltonian particle chains and investigate the richness of their interactions. One way to do this is to ...
Lotka–Volterra systems satisfying a strong Painlevé property

Bountis, Tassos; Vanhaecke, Pol (Physics Letters A, 2016-09)

We use a strong version of the Painlevé property to discover and characterize a new class of n-dimensional Hamiltonian Lotka–Volterra systems, which turn out to be Liouville integrable as well as superintegrable. These ...
Spectral Signatures of Exceptional Points and Bifurcations in the Fundamental Active Photonic Dimer

Kominis, Yannis; Kovanis, Vassilios; Bountis, Tassos (arXiv, 2018-08)

The fundamental active photonic dimer consisting of two coupled quantum well lasers is inves- tigated in the context of the rate equation model. Spectral transition properties and exceptional points are shown to occur ...
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 ...