  We present a novel scheme to stabilize high-frequency domain oscillations in
semiconductor superlattices by a time-delayed feedback loop. Applying concepts
from chaos control theory we propose to control the spatio-temporal dynamics of
fronts of accumulation and depletion layers which are generated at the emitter
and may collide and annihilate during their transit, and thereby suppress
chaos. The proposed method only requires the feedback of internal global
electrical variables, viz current and voltage, which makes the practical
implementation very easy.
