Negative high-frequency differential conductivity in semiconductor superlattices

Details Negative high-frequency differential conductivity in semiconductor superlattices Negative high-frequency differential conductivity in semiconductor superlattices

2002-09-16

arxiv.org/abs/cond-mat/0209365v1

Physics

Condensed Matter

Scientific paper

10.1063/1.1562003

We examine the high-frequency differential conductivity response properties of semiconductor superlattices having various miniband dispersion laws. Our analysis shows that the anharmonicity of Bloch oscillations (beyond tight-binding approximation) leads to the occurrence of negative high-frequency differential conductivity at frequency multiples of the Bloch frequency. This effect can arise even in regions of positive static differential conductivity. The influence of strong electron scattering by optic phonons is analyzed. We propose an optimal superlattice miniband dispersion law to achieve high-frequency field amplification.

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