Theory of parametric amplification in in superlattices

Details Theory of parametric amplification in in superlattices Theory of parametric amplification in in superlattices

2006-12-18

arxiv.org/abs/cond-mat/0612461v3

Phys. Rev. Lett. 98 (2007) 220404

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures. V2: typo in axis caption of fig 2 is corrected. V3: typo in ref 9 is corrected, stylistic changes in the m

Scientific paper

10.1103/PhysRevLett.98.220404

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 high-field domains inside the superlattice.

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