Self-sustained oscillations caused by magnetic field in a weakly-coupled GaAs/AlAs superlattice

We have investigated the influence of transverse magnetic field B up to 14 T at 1.6 K on the tunneling processes of electric field domains in doped weakly coupled GaAs/AlAs superlattices. Three regimes, i.e, stable field domains, current self-sustained oscillations and averaged field distribution are successively observed with increasing B. The mechanisms of switching-over among these regimes are due to B-induced modification of the dependence of the effective electron drift velocity on electric field. The simulated calculation gives a good agreement with the observed experimental results. (C) 2000 Published by Elsevier Science B.V. All rights reserved.

We have investigated the influence of transverse magnetic field B up to 14 T at 1.6 K on the tunneling processes of electric field domains in doped weakly coupled GaAs/AlAs superlattices. Three regimes, i.e, stable field domains, current self-sustained oscillations and averaged field distribution are successively observed with increasing B. The mechanisms of switching-over among these regimes are due to B-induced modification of the dependence of the effective electron drift velocity on electric field. The simulated calculation gives a good agreement with the observed experimental results. (C) 2000 Published by Elsevier Science B.V. All rights reserved.

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Lee Hysan Fdn.; Croucher Fdn.; KC Wong Educ Fdn.; Schlumberger Doll Res.; ARO FE.; AFOSR AOARD.; ONRASIA.

Chinese Acad Sci, Inst Semicond, NLSM, Beijing 100083, Peoples R China; Hong Kong Univ Sci & Technol, Dept Phys, Hong Kong, Peoples R China

Lee Hysan Fdn.; Croucher Fdn.; KC Wong Educ Fdn.; Schlumberger Doll Res.; ARO FE.; AFOSR AOARD.; ONRASIA.