Antireflection coating for miniband transport and Fabry–Pérot resonances in GaAs/AlGaAs superlattices

It is demonstrated that standard concepts for optics like Fabry–Pérot resonances and antireflection coatings can be extended to ballistic electron transport in semiconductor superlattices. The transmission through a superlattice miniband is increased by a factor of 2.4 if two further barriers are added at both sides of the structure. The condition for Fabry–Pérot resonances for Bloch states in finite periodic potentials is derived and experimental evidence for their existence is obtained in transport experiments.