66 citations · 599 across the 37 of their papers we have counts for
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Theory of parametric amplification in in superlattices
Timo Hyart, Alexey V. Shorokhov, Kirill N. Alekseev
We consider a high-frequency response of electrons in a single miniband of superlattice subject to dc and ac electric fields. We show that Bragg reflections in miniband result in a…
THz parametric gain in semiconductor superlattices in the absence of electric domains
Timo Hyart, Natalia V. Alexeeva, Ahti Leppanen +1
We theoretically show that conditions for THz gain and conditions for formation of destructive electric domains in semiconductor superlattices are fairly different in the case of p…
Quantum derivatives and high-frequency gain in semiconductor superlattices
A. V. Shorokhov, K. N. Alekseev
We derive simple difference formulas describing a small-signal absorption of THz field in a semiconductor superlattice driven by a microwave pump. We give a transparent geometric i…
Suppressed absolute negative conductance and generation of high-frequency radiation in semiconductor superlattices
Kirill N. Alekseev, Maxim V. Gorkunov, Natalia V. Demarina +3
We show that space-charge instabilities (electric field domains) in semiconductor superlattices are the attribute of absolute negative conductance induced by small constant and lar…