SKM 2023 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 4: Pattern Formation, Delay and Nonlinear Stochastic Systems

DY 4.8: Vortrag

Montag, 27. März 2023, 11:30–11:45, ZEU 250

Pulse generation in opto-electronic neurons with time-delayed feedback — •Jonas Mayer Martins1, Svetlana V. Gurevich1, and Julien Javaloyes21Institute for Theoretical Physics, University of Münster, Wilhelm-Klemm-Str. 9 and Center for Nonlinear Science (CeNoS), University of Münster, Corrensstrasse 2, 48149 Münster, Germany — 2Departament de Física and IAC-3, Universitat de les Illes Balears, C/ Valldemossa km 7.5, 07122 Mallorca, Spain

We study a neuromorphic circuit composed of a nano resonant tunneling diode (RTD) operated in the excitable regime, where the diode generates, when triggered, an all-or-nothing electrical response pulse. This pulse is fed into a nano laser diode (LD), which in turn emits an optical pulse that is re-injected with time delay back into the RTD. Our theoretical analysis of this time-delayed opto-electronic nonlinear system describes how such neuron-like excitability can lead to sustained periodic pulsations due to the time-delayed feedback. We derive a bifurcation diagram through numerical continuation, unveiling the rich dynamics of the system. Furthermore, direct numerical simulations of the RTD-LD reveal emerging solitons that may serve as memory for information. Opto-electronic neurons like the RTD-LD are particularly interesting because they allow for fast computations at very low energy consumption and are therefore promising candidates for new computational architectures that mimic the brain.

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