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Limit-cycle-induced frequency locking in self-sustained current oscillations in superlattices
The ac response of self-sustained current oscillations (SSCO's) in weakly coupled GaAs/AlAs superlattices (SL's) is derived based on the deformation of a limit cycle under an external ac driving force. Frequency locking into an integer fraction of the ac frequency is obtained in a periodic response in which a limit …