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Bloch oscillations in GaAs/AlGaAs superlattice: study for emitter design

The study is addressed to the decay dynamics of Bloch oscillations in GaAs/Al0.3Ga0.7As superlattice as a function of temperature and excitation density - characteristics those are very important for an emitter design. It is demonstrated that in the both cases the coherence of the wave packets is mainly lost due to the interband dephasing of the system. It is shown that the intraband dephasing is nearly independent on temperature within 9K-80K; the increase of exictation densities up to 1.5 109 cm-2 has weak influence on the decay dynamics of the Bloch oscillations (the decay rate is found to be about 0.6 ps-1 within all studied range). Dc electric field driven Bloch emitter based on three terminal device containing semiconductor superlattice is suggested and discussed.