Theory of parametric amplification in superlattices.
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 parametric resonance which is detectable using ac probe field. We establish theoretical feasibility of phase-sensitive THz amplification at the resonance. The parametric amplification does not require operation in conditions of negative differential conductance. This prevents a formation of destructive domains of high electric field inside the superlattice.
Department of Physical Sciences, FI-90014 University of Oulu, Finland.
Timo
T
Hyart
Alexey V
AV
Shorokhov
Kirill N
KN
Alekseev