Link between the Superconducting Dome and Spin-Orbit Interaction in the (111) LaAlO_{3}/SrTiO_{3} Interface

Area of Science:

• Condensed Matter Physics
• Materials Science
• Quantum Phenomena

Background:

• The LaAlO3/SrTiO3 interface is a key system for studying emergent electronic properties.
• Understanding the interplay between superconductivity and spin-orbit interaction is crucial for novel quantum devices.

Purpose of the Study:

• To investigate the gate voltage dependence of superconducting properties and spin-orbit interaction.
• To explore the correlation between superconductivity and spin-orbit interaction at the (111)-oriented interface.
• To explain the unconventional enhancement of the parallel upper critical field.

Main Methods:

• Measurement of gate voltage dependence of superconducting properties.
• Determination of spin-orbit interaction from superconducting parameters.
• Confirmation of spin-orbit interaction via weak-antilocalization measurements.

Main Results:

• Superconductivity observed in a dome-shaped region of the phase diagram.
• Superconducting transition temperature (Tc) and upper critical fields maximized at the same gate voltage.
• Spin-orbit interaction follows the same gate voltage dependence as Tc.
• Parallel upper critical field exceeds the Chandrasekhar-Clogston limit.

Conclusions:

• A nontrivial correlation exists between superconductivity and spin-orbit interaction.
• The observed phenomena suggest a strong coupling between these two properties.
• Further theoretical and experimental work is needed to fully elucidate the underlying mechanisms.