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Tuning adatom mobility and nanoscale segregation by twin formation and polytypism

机译：通过双形成和多液体调整Adatom Mobility和纳米级分离

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摘要

Nanoscale variations in the composition of an AlxGa1-xAs shell around a GaAs nanowire affect the nanowire functionality and can lead to the formation of localized quantum emitters. These composition fluctuations can be the consequence of variations of crystal phase and/or nanoscale adatom mobility. By applying electron-microscopy-related techniques we correlate the optical, compositional and structural properties at the nanoscale on the same object. The results indicate a clear correlation between the twin density in the nanowire and the quantum-emitter density as well as a significant redshift in the emission. We propose that twinning increases nanoscale segregation effects in ternary alloys. An additional redshift in the emission can be explained by the staggered band alignment between wurtzite and zinc-blende phases. This work opens new avenues in the achievement of homogeneous ternary and quaternary alloys in nanowires and in the engineering of the segregation effects at the nanoscale.
机译：GaAs纳米线周围AlxGA1-XAS壳组合物的纳米级变化影响纳米线功能，可以导致局部量子发射器的形成。这些组成波动可以是晶相和/或纳米级Adatom迁移率变化的结果。通过施加电子 - 微观相关技术，我们将纳米级的光学，组成和结构性质与同一物体的相关性相关联。结果表明纳米线中的双密度和量子发射器密度之间的明显相关性以及发射中的显着的红移。我们提出孪生在三元合金中增加了纳米级分离效应。发射中的额外射频可以通过诸如紫立岩和锌 - 融合阶段之间的交错带对准来解释。这项工作开设了在纳米线中的同质三元和四元合金实现的新途径，并在纳米级的分离效应的工程中。

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