Remote Doping of Scalable Nanowire Branches

Area of Science:

• Materials Science
• Condensed Matter Physics
• Quantum Technologies

Background:

• High-quality nanowire networks are crucial for advanced applications like topological quantum computing and ultrafast photodetection.
• Controlling carrier density and mean free path in nanowires is essential for device performance.
• Donor scattering is a significant factor limiting the mean free path in nanowire devices.

Purpose of the Study:

• To demonstrate a method for reducing donor scattering in indium gallium arsenide (InGaAs) nanowire networks.
• To improve the crystal quality and scalability of nanowire networks for quantum technologies.

Main Methods:

• Utilizing a selective-area epitaxy approach.
• Implementing a remote-doping strategy to minimize donor interactions.
• Conducting low-temperature magnetotransport measurements across nanowire Y-junctions.

Main Results:

• Successfully reduced donor scattering in InGaAs nanowire networks.
• Observed weak anti-localization, indicating strong spin-orbit interaction.
• Demonstrated the feasibility of creating ultraclean, scalable nanowire networks.

Conclusions:

• Remote doping is an effective strategy to enhance nanowire quality by minimizing donor scattering.
• The developed technique provides a scalable blueprint for fabricating advanced nanowire networks for quantum technologies.
• The findings pave the way for improved performance in topological quantum computing and photodetection devices.