Transition between synchronization and chaos in doped GaAs/AlAs superlattices

✍ Scribed by Yaohui Zhang; Robert Klann; Holger T. Grahn; Klaus H. Ploog

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 258 KB
• Volume: 21
• Category: Article
• ISSN: 0749-6036
• DOI: 10.1006/spmi.1996.0201

✦ Synopsis

The transition between chaotic and periodic regimes in spontaneous current oscillations of weakly coupled, doped GaAs/AlAs superlattices has been observed by varying the external d.c. bias. The chaotic current oscillations are observed for voltage ranges, which exhibit a large negative differential conductance in the time-averaged I-V characteristic. Since this system can be described by a spatially distributed, non-linear system with many degrees of freedom, the coupling between the degrees of freedom in the chaotic windows is repulsive, while in the periodic windows it is attractive.