Multiple-frequency current oscillations in GaAs-AlGaAs quantum wells containing a thin semi-insulating layer

  • Z. H. DaiEmail author
  • J. Ni
Mesoscopic Physics


We have investigated non-equilibrium electron transport properties of a quantum well with an inserted thin semi-insulating potential barrier layer in nonlinear bias using a time-dependent simulation technique. We find that the charge redistribution with time in the whole structure has an important effect on the final current-voltage (I-V) curves. The results show that there are two evident current hysteresis phenomena in the negative differential conductance regions and the inserted semi-insulating potential barrier layer induces the formation of multiple emitter quantum wells, which leads to high-frequency terahertz current oscillations with multiple-frequency relations around the valley of current.


Neural Network Electron Transport Nonlinear Dynamics Transport Property Simulation Technique 
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© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2005

Authors and Affiliations

  1. 1.Department of Physics and Key Laboratory of Atomic and Molecular Nanoscience, Tsinghua UniversityBeijingP.R. China
  2. 2.Department of PhysicsYantai UniversityYantaiP.R. China

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