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Anomaly of the current self-oscillation frequency in the sequential tunneling of a doped GaAs/AlAs superlattice

Authors Wang, Xiangrong View this author's profile
Wang, Jiannong View this author's profile
Sun, Baoquan
Jiang, Desheng
Issue Date 2000
Source Physical Review B , v. 61, (11), 2000, Mar, p. 7261-7264
Summary An anomalous behavior of the current self-oscillation frequency is observed in the dynamic dc voltage bands, emerging from each sawtoothlike branch of the current-voltage characteristic of a doped GaAs/AlAs superlattice in the transition process from static to dynamic electric field domain formations. Varying the applied dc voltage at a fixed temperature, we find that the frequency increases while the averaged current decreases. Inside each voltage band, the frequency has a strong voltage dependence in the temperature range where the averaged current changes with the applied dc voltage. This dependence can be understood in terms of motion of the system along a limit cycle.
ISSN 1098-0121
Rights © 2000 American Physical Society
Language English
Format Article
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