The coupling between a two-level system and its environment leads todecoherence. Within the context of coherent manipulation of electronic orquasiparticle states in nanostructures, it is crucial to understand the sourcesof decoherence. Here, we study the effect of electron-phonon coupling in agraphene and an InAs nanowire double quantum dot. Our measurements revealoscillations of the double quantum dot current periodic in energy detuningbetween the two levels. These periodic peaks are more pronounced in thenanowire than in graphene, and disappear when the temperature is increased. Weattribute the oscillations to an interference effect between two alternativeinelastic decay paths involving acoustic phonons present in these materials.This interpretation predicts the oscillations to wash out when temperature isincreased, as observed experimentally.
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