Tuning spin-orbit coupling and superconductivity at the SrTiO3/LaAlO3 interface: a magneto-transport study

TL;DR

This study investigates how electric field tuning affects superconductivity and spin-orbit coupling at the SrTiO3/LaAlO3 interface through magneto-transport measurements, revealing a correlated relationship between spin-orbit energy and superconducting transition temperature.

Contribution

It demonstrates the tunability of spin-orbit coupling and superconductivity at the interface using electric fields, providing insights into their interdependence.

Findings

Spin-orbit coupling energy is tunable via electric field.

The spin-orbit energy correlates with the superconducting Tc.

Gate voltage influences mobility and anomalous Hall effect.

Abstract

The superconducting transition temperature, Tc, of the SrTiO3/LaAlO3 interface was varied by the electric field effect. The anisotropy of the upper critical field and the normal state magneto-transport were studied as a function of gate voltage. The spin-orbit coupling energy is extracted. This tunable energy scale is used to explain the strong gate dependence of the mobility and of the anomalous Hall signal observed. The spin-orbit coupling energy follows Tc for the electric field range under study.