Coupled Bloch-phonon oscillations in biased InGaAs/InAlAs superlattices

Summary form only given. We present experimental results on coupled Bloch-phonon oscillations in a ternary superlattice grown lattice-matched on trip. The well and barrier thicknesses are 8.4 and 51.6 /spl Aring/, respectively, leading to a first electronic miniband of 60 meV width that is weakly confined. This miniband width enables the coherent optical excitation of Bloch oscillations that are tunable above the LO phonon frequencies of both superlattice barriers and wells. The coherent polarizations of the coupled carrier and lattice dynamics are detected via a time-resolved electro-optic sampling technique.