Towards fabrication of ordered gallium nanostructures by laser manipulation of neutral atoms: study of self-assembling phenomena

TL;DR

This study investigates how gallium atoms self-assemble on patterned silicon surfaces, revealing that deposition rate variation, not surface diffusion, primarily influences nanostructure growth, aiding future atom nanofabrication efforts.

Contribution

It demonstrates that surface diffusion does not significantly affect gallium nanostructure formation, emphasizing the role of deposition rate variation in atom nanofabrication.

Findings

Self-organization of gallium atoms observed on silicon surfaces.

Surface diffusion does not significantly influence nano-island formation.

Deposition rate variation is the main factor affecting growth differences.

Abstract

Surface diffusion has an impact on the lateral resolution of nanostructures in bottom-up atom nanofabrication. In this paper we study the effects of the gallium atoms self-assembled on silicon surfaces (100) patterned with trenches at different slopes. These particular substrate morphologies have been made to enable an effective deposition rate variation along the surface. In this way we experimentally mimic the effect of the atomic flux modulation created by standing wave during an atom nanofabrication experiment. Even if we observe self organization of gallium atoms on the surface, we conclude that the nano-islands are not affected by surface diffusion processes and the effective variation of the deposition rate per unit area is the dominant factor affecting the growth differences along the surface. This result demonstrates that the gallium atoms self-organization should not prevent the observation of a periodic nano-patterning created by atom nano-fabrication techniques.