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Light-induced negative differential resistance and neural oscillations in neuromorphic photonic semiconductor micropillar sensory neurons.
Sci Rep
February 2025
INL-International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga S/N, 4715-330, Braga, Portugal.
Neuromorphic systems, inspired by nature, are sought to efficiently process analogue inputs in real and complex environments. This could lead to ultralow-power in-sensor intelligent edge computers. Here, we present an artificial sensory oscillator neuron consisting of a III-V semiconductor micropillar quantum resonant tunnelling diode (RTD) with GaAs photosensitive absorption layers.
View Article and Find Full Text PDFFate of Boltzmann's breathers: Kinetic theory perspective.
Phys Rev E
October 2024
LPTMS, UMR 8626, CNRS, Université Paris-Saclay, 91405 Orsay, France and ENS de Lyon, F-69364 Lyon, France.
The dynamics of a system composed of elastic hard particles confined by an isotropic harmonic potential are studied. In the low-density limit, the Boltzmann equation provides an excellent description, and the system does not reach equilibrium except for highly specific initial conditions: it generically evolves toward and stays in a breathing mode. This state is periodic in time, with a Gaussian velocity distribution, an oscillating temperature, and a density profile that oscillates as well.
View Article and Find Full Text PDFHydrodynamic modulation instability triggered by a two-wave system.
Chaos
October 2024
Disaster Prevention Research Institute, Kyoto University, Uji, Kyoto 611-0011, Japan.
Article Synopsis
- Modulation instability (MI) causes regular nonlinear wave trains to break down, potentially resulting in localized phenomena like rogue waves across various nonlinear dispersive media, including hydrodynamics and optics.
- The classical MI dynamics can start with small-amplitude sidebands around a main wave peak, often visualized as a three-wave interaction setup in experiments, but more complex patterns can emerge through breather solutions of the nonlinear Schrödinger equation (NLSE).
- This study explores MI in deep-water surface gravity waves, demonstrating that it can be initiated by just a single unstable sideband, yielding experimental results that align closely with nonlinear simulations, while also indicating shifts in focusing cycle behavior observed in longer-term wave evolution.
Resonant Akhmediev breathers.
Sci Rep
May 2024
Photonics Devices and Systems Group, Singapore University of Technology and Design, 8 Somapah Rd., Singapore, 487372, Singapore.
Modulation instability is a phenomenon in which a minor disturbance within a carrier wave gradually amplifies over time, leading to the formation of a series of compressed waves with higher amplitudes. In terms of frequency analysis, this process results in the generation of new frequencies on both sides of the original carrier wave frequency. We study the impact of fourth-order dispersion on this modulation instability in the context of nonlinear optics that lead to the formation of a series of pulses in the form of Akhmediev breather.
View Article and Find Full Text PDFBright traveling breathers in media with long-range nonconvex dispersion.
Phys Rev E
March 2024
Department of Applied Mathematics, University of Colorado Boulder, Boulder, Colorado 80309, USA.
The existence and properties of envelope solitary waves on a periodic traveling-wave background, called traveling breathers, are investigated numerically in representative nonlocal dispersive media. Using a fixed-point computational scheme, a space-time boundary-value problem for bright traveling breather solutions is solved for the weakly nonlinear Benjamin-Bona-Mahony equation, a nonlocal, regularized shallow water wave model, and the strongly nonlinear conduit equation, a nonlocal model of viscous core-annular flows. Curves of unit-mean traveling breather solutions within a three-dimensional parameter space are obtained.
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