Absolute Instability in Superlattice Miniband Transport
LEI Xiao-lin
State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Metallurgy, Chinese Academy of Sciences, Shanghai 200050
Absolute Instability in Superlattice Miniband Transport
LEI Xiao-lin
State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Metallurgy, Chinese Academy of Sciences, Shanghai 200050
关键词 ：
72.30.+q ,
72.20.Ht ,
73.50.Mx
Abstract ： The possible absolute instability in superlattice miniband transport using the hydrodynamic balance equations for arbitrary energy dispersion is investigated. In contrast to the prediction of the drift-diffusion model that in doped semiconductor superlattices absolute instability occurs closely following the onset of negative differential mobility (NDM), the present analysis shows that a wide-miniband planar superlattice may become absolutely unstable only when it is biased deep in the NDM regime. This result is in agreement with recent experimental findings.
Key words ：
72.30.+q
72.20.Ht
73.50.Mx
出版日期: 1997-08-01
:
72.30.+q
(High-frequency effects; plasma effects)
72.20.Ht
(High-field and nonlinear effects)
73.50.Mx
(High-frequency effects; plasma effects)
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