Epitaxy of semiconductor-superconductor nanowires

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Controlling semiconductor/metal interfaces is crucial for advanced electrical devices.
• Semiconductor/superconductor hybrids require atomic-scale interface uniformity for high-quality superconducting gaps.

Purpose of the Study:

• To present a novel method for epitaxial growth of semiconductor-metal core-shell nanowires.
• To enable controlled electrical contacting of nanostructures and design of specialized electronic devices.
• To address the soft-gap problem in superconducting hybrid structures.

Main Methods:

• Epitaxial growth of Indium Arsenide/Aluminum (InAs/Al) core-shell nanowires using molecular beam epitaxy.
• Formulation of metal phase grain growth kinetics using continuum parameters and bicrystal symmetries.
• Investigation of alternative semiconductor/metal combinations for epitaxial interface matching in nanowires.

Main Results:

• Achieved epitaxially matched single-plane interfaces in InAs/Al nanowires.
• Demonstrated a method realizing the ultimate limit of uniform interfaces.
• Provided a solution to the soft-gap problem in superconducting hybrid structures.

Conclusions:

• Epitaxial core-shell nanowire growth offers a new route for controlled electrical contacting.
• This method facilitates the design of topological and gate-controlled superconducting electronics.
• The achieved interface uniformity is key to high-performance superconducting hybrid devices.