Site-selective substitutional doping with atomic precision on stepped Al (111) surface by single-atom manipulation

Area of Science:

• Materials Science
• Surface Science
• Quantum Computing

Background:

• Precise positioning of individual dopants is crucial for fabricating advanced nano- and quantum devices.
• Current methods for atomic manipulation face challenges in achieving site-specific doping on metal surfaces.

Purpose of the Study:

• To propose and validate a computational method for substitutional doping of individual atoms at specific sites on stepped metal surfaces.
• To demonstrate the feasibility of single-atom manipulation for targeted dopant placement.

Main Methods:

• Utilizing first-principles simulations to model the atom manipulation process.
• Analyzing potential energy curves to determine the energetics and feasibility of atom extraction and placement.
• Simulating the interaction between an aluminum (Al) trimer-apex tip and a stepped Al (111) surface.

Main Results:

• A method for vertically extracting a selected surface atom using an Al trimer-apex tip was proposed.
• The dopant atom can be precisely positioned at the vacated site on the stepped surface.
• Potential energy curves indicate the reliability and feasibility of the proposed single-atom doping process.

Conclusions:

• The proposed first-principles simulation method offers a reliable approach for site-specific substitutional doping.
• This technique is critical for the precise fabrication of nano- and quantum devices with tailored functionalities.
• Single-atom manipulation provides a pathway for advancing the development of next-generation electronic devices.