Abstract
Summary form only given. Electrons in an electrically biased superlattice execute Bloch oscillations (BO) at THz frequencies. The BOs can be tuned into resonance with other THz modes, such as plasmons and coherent longitudinal optical (LO) phonons. The coupling of BOs to such modes strongly affects the dephasing dynamics and thus the associated THz emission.Contrary to conventional mode-coupling theory, the experimental oobservation of the direct coupling of BOs with LO phonons in GaAs/AlGaAs superlattices reveals that there is no gap in the coupled spectrum at resonance. However, there is a substantial transfer of coherence from BOs to LO phonons at resonance, leading to an enhancement of the phonon amplitude. Starting from a microscopic Hamiltonian with polar (Frohlich) coupled LO phonons and superlattice electrons in an external field, we explain the non-existence of the gap and the resonant transfer of coherence.
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