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Current self-oscillations and chaos in semiconductor superlattices

✍ Scribed by H.T. Grahn

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
722 KB
Volume
25
Category
Article
ISSN
0749-6036

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✦ Synopsis

The nonlinear transport properties of weakly coupled superlattices have been investigated by measuring real-time current traces and frequency spectra. Current self-oscillations are observed for the undriven system by simply applying a dc voltage. Doped superlattices as well as photoexcited undoped superlattices can exhibit self-oscillations of the current. When the system is driven with an external ac voltage in addition to the dc voltage, the superlattices exhibit frequency-locked, quasiperiodic, and chaotic windows as a function of the amplitude of the driving voltage.

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