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arXiv 1104.3754cond-mat.mes-hall
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剪裁量子系统中的相干电子-声子耦合

Coherent Electron-Phonon Coupling in Tailored Quantum Systems

P. Roulleau, S. Baer, T. Choi, F. Molitor, J. Güttinger, T. Müller, S. Dröscher, K. Ensslin, T. Ihn

摘要:

二能级系统与环境的耦合导致退相干。在纳米结构中电子或准粒子态的相干操纵的背景下,理解退相干的来源是至关重要的。在这里,我们研究了石墨烯和InAs纳米线双量子点中的电子-声子耦合效应。我们的测量揭示了双量子点电流在两个能级之间的能量失谐周期性振荡。这些周期峰在纳米线中比在石墨烯中更明显,并且当温度升高时消失。我们归因于两个替代的非弹性衰减路径,涉及声学声子存在于这些材料之间的干扰效应的振荡。这种解释预测了当温度升高时,振荡会消失,正如实验所观察到的那样。

英文摘要:

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

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