Nonlinear Coupling of Oscillatory Modes in Current Flow in Semi-Insulating GaAs |
| K. Karpińska and J. Łusakowski Institute of Experimental Physics, Warsaw University, ul. Hoża 69, 00-681 Warszawa, Poland |
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| Spontaneous current oscillations in semi-insulating (SI) GaAs sample caused by high electric field domains nucleation were perturbed by modulated illumination. Coupling between domain and photocurrent oscillations leads to quasiperiodic and frequency-locked behaviour. The observed Arnol'd tongues structure follows the Farey tree ordering and agrees with predictions of the circle map theory. We also suggest a possible mechanism responsible for the coupling of the modes. |
| DOI: 10.12693/APhysPolA.80.425 PACS numbers: 72.20.Ht |