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- W2897557348 abstract "Crystal growth often proceeds by atomic step flow. When the surface area available for growth is limited, the nucleation and progression of the steps can be affected. This issue is particularly relevant to the formation of nanocrystals. We examine the case of Au-catalyzed GaAs nanowires, which we grow in a transmission electron microscope. Our in situ observations show that atomic layers nucleate at the periphery of the interface between the nanowire and the catalyst droplet. From this starting location, the atomic step flows within a restricted area of hexagonal shape. At specific partial coverages, the monolayer configuration changes abruptly. A simple model based on the geometry of the system and its edge energies explains these observations. In particular, we observe an inversion of the step curvature which reveals that the effective energy per unit length of monolayer edge is much lower at the interface periphery than inside the catalyst droplet.Received 26 April 2018Revised 14 July 2018DOI:https://doi.org/10.1103/PhysRevLett.121.166101© 2018 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasCrystal growthCrystallizationIslandNanocrystalsNucleation on surfacesTechniquesTransmission electron microscopyCondensed Matter & Materials Physics" @default.
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- W2897557348 date "2018-10-19" @default.
- W2897557348 modified "2023-10-02" @default.
- W2897557348 title "Atomic Step Flow on a Nanofacet" @default.
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- W2897557348 doi "https://doi.org/10.1103/physrevlett.121.166101" @default.
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