BPCPPDYSOE21 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 20: Nonlinear Dynamics 1 - organized by Azam Gholami (Göttingen)

DY 20.2: Vortrag

Dienstag, 23. März 2021, 09:20–09:40, DYc

Laminar Chaos in Experiments: Nonlinear Systems with Time-Varying Delays and Noise — •David Müller-Bender¹, Andreas Otto¹, Günter Radons¹, Joseph D. Hart^2,3, and Rajarshi Roy^2,3,4 — ¹Institute of Physics, Chemnitz University of Technology, 09107 Chemnitz, Germany — ²Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742, USA — ³Department of Physics, University of Maryland, College Park, Maryland 20742, USA — ⁴Institute for Physical Science and Technology, University of Maryland, College Park, Maryland 20742, USA

A new type of dynamics called laminar chaos was discovered in systems with time-varying delay [1]. It is a low-dimensional dynamics characterized by laminar phases of nearly constant intensity with periodic durations and a chaotic variation of the intensity from phase to phase. This is in contrast to the typically observed higher-dimensional turbulent chaos, which is characterized by strong fluctuations. In this work [2], we demonstrate experimentally and theoretically that laminar chaos is a robust phenomenon. Therefore, we provide the first experimental observation of laminar chaos by studying an optoelectronic feedback loop with time-varying delay and provide a time-series analysis toolbox for its detection. The toolbox is benchmarked by experimental data and by time-series of a delayed Langevin equation.

[1] Müller, Otto, and Radons, Phys. Rev. Lett. 120, 084102 (2018).

[2] Hart, Roy, Müller-Bender, Otto, and Radons, Phys. Rev. Lett. 123, 154101 (2019).