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

Authors X. R. Wang
J. N. Wang
B. Q. Sun
D. S. Jiang
Issue Date 2000
Source Physical Review B, v. 61, (11), March 2000
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
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