Detecting Induced p±ip Pairing at the Al-InAs Interface with a Quantum Microwave Circuit

Area of Science:

• Quantum Information Science
• Condensed Matter Physics
• Materials Science

Background:

• Superconductor-semiconductor hybrid devices are crucial for quantum information processing.
• Fundamental properties of these hybrid systems require further investigation.
• Understanding superconductivity breakdown is essential for device stability.

Purpose of the Study:

• To investigate the basic properties of a two-dimensional aluminum-indium arsenide (Al-InAs) hybrid system.
• To probe the breakdown of superconductivity in response to an applied magnetic field.
• To quantitatively compare experimental findings with theoretical models.

Main Methods:

• Embedding a two-dimensional Al-InAs hybrid system within a resonant microwave circuit.
• Applying an external magnetic field to induce superconductivity breakdown.
• Utilizing microwave circuit measurements to analyze the system's response.

Main Results:

• Observed a distinct fingerprint indicative of the hybrid system's two-component nature.
• Quantitatively matched experimental data with a theory incorporating intraband p±ip pairing and Bogoliubov-Fermi surfaces.
• Successfully resolved contributions from both aluminum and indium arsenide components.

Conclusions:

• The study provides a quantitative understanding of superconductivity breakdown in Al-InAs hybrid systems.
• The findings validate theoretical models including complex pairing mechanisms and emergent phenomena.
• Experimental separation of Al and InAs contributions enables precise determination of indium arsenide carrier density and mobility.