Abstract
The conditions for forming static and high-frequency negative conductivities of semiconductor superlattices with different fractions of the region of negative effective mass in the miniband are investigated. It is demonstrated that a decrease in the negative-mass fraction leads to broadening of the regions of both the negative differential and negative absolute conductivities of superlattices and to the occurrence of additional harmonic-field instability regions. The development of static instability in a superlattice arranged in an open external dc current circuit can result in the generation of both integrally and fractionally quantized static fields.
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Original Russian Text © Yu.Yu. Romanova, 2015, published in Fizika i Tekhnika Poluprovodnikov, 2015, Vol. 49, No. 12, pp. 1605–1611.
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Romanova, Y.Y. On the role of negative effective masses in the formation of the conductivity of semiconductor superlattices. Semiconductors 49, 1557–1563 (2015). https://doi.org/10.1134/S1063782615120167
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DOI: https://doi.org/10.1134/S1063782615120167