Berlin 2018 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 81: Nonlinear Dynamics, Synchronization, Chaos II
DY 81.2: Vortrag
Freitag, 16. März 2018, 10:15–10:30, BH-N 243
Memristive Devices in a Chua Circuit: Comprizing Memory and deterministic Chaos — •Tom Birkoben1, Mirko Hansen1, Martin Ziegler1, Karlheinz Ochs2, Enver Solan2, and Hermann Kohlstedt1 — 1Chair of Nanoelectronics, Faculty for Electrical Engineering and Information Technology, Kiel University, Germany — 2Chair of Digital Communication Systems, Department of Electrical Engineering and Information Science, Ruhr University Bochum, Germany
Chua’s circuit consists at least of one non-linear electronic device, a locally active resistor and three energy-storage elements. The circuit attracts considerable interest because it allows the study of a variety of chaos related phenomena, such as double scroll attractors and bifurcation diagrams. Here we present experimental results of a Chua circuit compromising real memristive double barrier Nb/Al/Al2O3/NbxOy/Au junctions. The devices are forming free and the I-V curves are characterized by an analog switching mechanism with a typical Roff/Ron ratio of about 100 at 0.7 V. Besides inserting a single memristive device in parallel to Chua’s diode, the diode was replaced by two anti-parallel connected memristive devices. In this way, multiple scroll attractors were obtained. The dynamics of the system were characterized by chaotic oscillations interrupted by minute long time intervals in which the oscillations were suppressed. The results will be discussed in the framework of time series measurements and compared to simulations in LTSpice.