Wavefront depinning in semiconductor superlattices due to discrete-mapping failure |
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Authors: | Wang Jun and Zheng Zhi-Gang |
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Institution: | Department of Physics and the Beijing-Hong Kong-Singapore
Joint Center for Nonlinear and Complex Systems (Beijing),
Beijing
Normal University, Beijing 100875, China |
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Abstract: | We investigate the wavefronts depinning in current biased,
infinitely long semiconductor superlattice systems by the method of
discrete mapping and show that the wavefront depinning corresponds
to the discrete mapping failure. For parameter values near the lower
critical current in both discrete drift model (DD model) and
discrete drift--diffusion model (DDD model), the mapping failure is
determined by the important mapping step from the bottom of branch
$\gamma$ to branch $\alpha$. For the upper critical parameters in
DDD model, the key mapping step is from branch $\gamma$ to the top
of the corresponding branch $\alpha$, and we may need several active
wells to describe the wavefronts. |
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Keywords: | semiconductor superlattice wavefront depinning sequential tunnelling |
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