114 citations · 410 across the 25 of their papers we have counts for
25 papers
Lossless propagation of gain-compensated graphene plasmons
Andrianos Sygrimis, Giorgos P. Tsironis
Graphene supports surface plasmon polaritons with extreme field confinement and electrical tunability, but these waves are typically short-lived due to ohmic loss in the sheet. We…
Searching for Quantum Effects in the Brain: A Bell-Type Test for Nonclassical Latent Representations in Autoencoders
I. K. Kominis, C. Xie, S. Li +2
Whether neural information processing is entirely classical or involves quantum-mechanical elements remains an open question. Here we propose a model-agnostic, information-theoreti…
Targeted energy transfer dynamics and chemical reactions
N. Almazova, S. Aubry, G. P. Tsironis
Ultrafast reaction processes take place when resonant features of nonlinear model systems are taken into account. In the targeted energy or electron transfer dimer model this is ac…
T-wave Inversion through Inhomogeneous Voltage Diffusion within the FK3V Cardiac Model
E. Angelaki, N. Lazarides, G. D. Barmparis +3
The heart beats due to the synchronized contraction of cardiomyocytes triggered by a periodic sequence of electrical signals called action potentials, which originate in the sinoat…
Exploring Quantum Neural Networks for the Discovery and Implementation of Quantum Error-Correcting Codes
A. Chalkiadakis, M. Theocharakis, G. D. Barmparis +1
We investigate the use of Quantum Neural Networks for discovering and implementing quantum error-correcting codes. Our research showcases the efficacy of Quantum Neural Networks th…
Identifying Discrete Breathers Using Convolutional Neural Networks
T. Dogkas, M. Eleftheriou, G. D. Barmparis +1
Artificial intelligence in the form of deep learning is now very popular and directly implemented in many areas of science and technology. In the present work we study time evoluti…
Quantum targeted energy transfer through machine learning tools
I. Andronis, G. Arapantonis, G. D. Barmparis +1
In quantum targeted energy transfer, bosons are transferred from a certain crystal site to an alternative one, utilizing a nonlinear resonance configuration similar to the classica…
Analysis of chaotic dynamical systems with autoencoders
N. Almazova, G. D. Barmparis, G. P. Tsironis
We focus on chaotic dynamical systems and analyze their time series with the use of autoencoders, i.e., configurations of neural networks that map identical output to input. This a…
Dynamical symmetry breaking through AI: The dimer self-trapping transition
G. P. Tsironis, G. D. Barmparis, D. K. Campbell
The nonlinear dimer obtained through the nonlinear Schr{ö}dinger equation has been a workhorse for the discovery the role nonlinearity plays in strongly interacting systems. While…
Discovering nonlinear resonances through physics-informed machine learning
G. D. Barmparis, G. P. Tsironis
For an ensemble of nonlinear systems that model, for instance, molecules or photonic systems, we propose a method that finds efficiently the configuration that has prescribed trans…
Estimating the infection horizon of COVID-19 in eight countries with a data-driven approach
G. D. Barmparis, G. P. Tsironis
The COVID-19 pandemic has affected all countries of the world producing a substantial number of fatalities accompanied by a major disruption in their social, financial, and educati…
Pattern formation and chimera states in 2D SQUID metamaterials
Johanne Hizanidis, Nikos Lazarides, Giorgos P. Tsironis
The Superconducting QUantum Interference Device (SQUID) is a highly nonlinear oscillator with rich dynamical behavior, including chaos. When driven by a time-periodic magnetic flux…
Point interactions with bias potentials
A. V. Zolotaryuk, G. P. Tsironis, Y. Zolotaryuk
We develop an approach on how to define single-point interactions under the application of external fields. The essential feature relies on an asymptotic method based on the one-po…
Chimera states in networks of locally and non-locally coupled SQUIDs
J. Hizanidis, N. Lazarides, G. P. Tsironis
Planar and linear arrays of SQUIDs (superconducting quantum interference devices), operate as nonlinear magnetic metamaterials in microwaves. Such {\em SQUID metamaterials} are par…
Controlled Generation of Chimera States in SQUID Metasurfaces using DC Flux Gradients
N. Lazarides, J. Hizanidis, G. P. Tsironis
SQUID (Superconducting QUantum Interference Device) metamaterials, subject to a time-independent (dc) flux gradient and driven by a sinusoidal (ac) flux field, support chimera stat…
Machine learning with observers predicts complex spatiotemporal behavior
G. Neofotistos, M. Mattheakis, G. D. Barmparis +3
Chimeras and branching are two archetypical complex phenomena that appear in many physical systems; because of their different intrinsic dynamics, they delineate opposite non-trivi…
Localized patterns in star networks of Class B lasers with optoelectronic feedback
Joniald Shena, Johanne Hizanidis, Nikos E. Kouvaris +1
We analyze how a star network topology shapes the dynamics of coupled CO\textsubscript{2} lasers with an intracavity electro-optic modulator that exhibit bistability. Such a networ…
Flux bias-controlled chaos and extreme multistability in SQUID oscillators
Johanne Hizanidis, Nikos Lazarides, George Tsironis
The radio frequency (rf) Superconducting QUantum Interference Device (SQUID) is a highly nonlinear oscillator exhibiting rich dynamical behavior. It has been studied for many years…
Graphene and active metamaterials: theoretical methods and physical properties
Marios Mattheakis, Giorgos P. Tsironis, Efthimios Kaxiras
The interaction of light with matter has triggered the interest of scientists for long time. The area of plasmonics emerges in this context through the interaction of light with va…
Resilience of symmetry against stochasticity in a gain-loss balanced oscillator
Mirko Luković, Patrick Navez, Giorgos P. Tsironis +1
We investigate the effects of dichotomous noise added to a classical harmonic oscillator in the form of stochastic time-dependent gain and loss states, whose durations are sampled…
Robust chimera states in SQUID metamaterials with local interactions
J. Hizanidis, N. Lazarides, G. P. Tsironis
We report on the emergence of robust multi-clustered chimera states in a dissipative-driven system of symmetrically and locally coupled identical SQUID oscillators. The "snake-like…
Resonant Combinatorial Frequency Generation Induced by a PT-symmetric Periodic Layered Stack
Oksana V. Shramkova, Giorgos P. Tsironis
The nonlinear interaction of waves in PT-symmetric periodic stacks with an embedded nonlinear anisotropic dielectric layer illuminated by plane waves of two tones is examined. The…
Long-lived discrete breathers in free-standing graphene
Alberto Fraile, Emmanuel N. Koukaras, Konstantinos Papagelis +2
Intrinsic localized modes or discrete breathers are investigated by molecular dynamics simulations in free-standing graphene. Discrete breathers are generated either through therma…
Small-world networks of optical fiber lattices
F. Perakis, M. Mattheakis, G. P. Tsironis
We use a simple dynamical model and explore coherent dynamics of wavepackets in complex networks of optical fibers. We start from a symmetric lattice and through the application of…