Mechanism of periodic height variations along self-aligned VLS-grown planar nanostructures

摘要: In this study we report in-plane nanotracks produced by molecular-beam-epitaxy (MBE) exhibiting lateral self-assembly and unusual periodic out-of-phase height variations across their growth axes. The are synthesized using bismuth segregation on the GaAsBi epitaxial surface, which results in metallic liquid droplets capable of catalyzing nanotrack via vapor–liquid–solid (VLS) mechanism. A detailed examination morphologies is carried out employing a combination scanning electron atomic force microscopy and, based findings, geometric model during MBE developed. Our indicate diffusion shadowing effects play significant roles defining interesting shape. unique periodicity our originates from rotating nucleation “hot spot” at edge liquid–solid interface, feature caused relative circling non-normal ion beam flux incident sample inside chamber. We point that such concept divergent current models crawling mode kinetics conclude these may be utilized design assembly planar nanostructures with controlled non-monotonous structure.