Volume 112, Number 3, November 2015
|Number of page(s)||5|
|Published online||26 November 2015|
Chaos synchronization in networks of semiconductor superlattices
1 Key Laboratory of Nano devices and Applications, Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences - Suzhou 215125, China
2 Department of Physics, Bar-Ilan University - Ramat-Gan 52900, Israel
3 Paul-Drude-Institut für Festkörperelektronik - Hausvogteiplatz 5–7, 10117 Berlin, Germany
4 Gonda Interdisciplinary Brain Research Center, Bar-Ilan University - Ramat-Gan 52900, Israel
Received: 4 September 2015
Accepted: 6 November 2015
Chaos synchronization has been demonstrated as a useful building block for various tasks in secure communications, including a source of all-electronic ultrafast physical random number generators based on room temperature spontaneous chaotic oscillations in a DC-biased weakly coupled GaAs/Al0.45Ga0.55As semiconductor superlattice (SSL). Here, we experimentally demonstrate the emergence of several types of chaos synchronization, e.g. leader-laggard, face-to-face and zero-lag synchronization in network motifs of coupled SSLs consisting of unidirectional and mutual coupling as well as self-feedback coupling. Each type of synchronization clearly reflects the symmetry of the topology of its network motif. The emergence of a chaotic SSL without external feedback and synchronization among different structured SSLs open up the possibility for advanced secure multi-user communication methods based on large networks of coupled SSLs.
PACS: 05.45.Xt – Synchronization; coupled oscillators / 05.45.Vx – Communication using chaos / 73.21.Cd – Superlattices
© EPLA, 2015
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