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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 |
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| Cite this article: |
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LEI Xiao-lin 1997 Chin. Phys. Lett. 14 605-608 |
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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.
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| Keywords:
72.30.+q
72.20.Ht
73.50.Mx
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Published: 01 August 1997
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| PACS: |
72.30.+q
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(High-frequency effects; plasma effects)
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72.20.Ht
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(High-field and nonlinear effects)
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73.50.Mx
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(High-frequency effects; plasma effects)
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