研究目的
To enable fabrication of scalable III-V nanowire networks required to test proposals for Majorana-based quantum computing devices by defining the growth parameter window resulting in selective growth.
研究成果
The study successfully maps the selectivity windows for GaAs and InAs SAG, identifying the difference in group III adatom desorption rates as the primary mechanism governing selectivity. High-quality InAs and GaAs nanowire networks are realized on various substrates, demonstrating phase coherence in quantum transport applications. This work provides a foundation for optimizing III-V nanostructure growth for advanced quantum devices.
研究不足
The study focuses on GaAs and InAs compounds, with limited information on other III-V materials. The mechanism of selectivity is primarily attributed to group III adatom desorption rates, but detailed understanding of group V desorption's role is less explored.
1:Experimental Design and Method Selection:
The study employs molecular beam epitaxy (MBE) for selective area growth (SAG) of III-V nanowire networks. In-situ reflection high-energy electron diffractometry (RHEED) is used to monitor growth modes and transitions.
2:Sample Selection and Data Sources:
GaAs(001) substrates with patterned SiOx mask are used for initial studies, extending to InAs, InP, and GaAs substrates of both (001) and (111)B orientations.
3:List of Experimental Equipment and Materials:
MBE system, RHEED, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and atomic force microscopy (AFM).
4:Experimental Procedures and Operational Workflow:
Growth conditions are varied to map the selectivity window for GaAs and InAs, focusing on group III and V flux rates and substrate temperatures.
5:Data Analysis Methods:
Analysis of RHEED patterns, SEM, and TEM images to determine growth modes, structural quality, and chemical composition.
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