Electron spin-orbit splitting in InGaAs/InP quantum well studied by means of the weak antilocalization and spin-zero effects in tilted magnetic fields

TL;DR

This study investigates the interplay of Zeeman and Rashba spin-orbit effects in InGaAs/InP quantum wells using weak antilocalization and Shubnikov-de Haas oscillations in tilted magnetic fields, providing insights into spin splitting mechanisms.

Contribution

It presents a combined experimental approach to quantify Rashba and Zeeman spin splittings in quantum wells, revealing their non-additive behavior in tilted magnetic fields.

Findings

Rashba parameter and g-factor extracted from spin-zero positions.

Good agreement between spin-zero and WAL measurements of spin-orbit coupling.

Tilted magnetic fields enhance spin-zero features, aiding in parameter determination.

Abstract

The coupling between Zeeman spin splitting and Rashba spin-orbit terms has been studied experimentally in a gated InGaAs/InP quantum well structure by means of simultaneous measurements of the weak antilocalization (WAL) effect and beating in the SdH oscillations. The strength of the Zeeman splitting was regulated by tilting the magnetic field with the spin-zeros in the SdH oscillations, which are not always present, being enhanced by the tilt. In tilted fields the spin-orbit and Zeeman splittings are not additive, and a simple expression is given for the energy levels. The Rashba parameter and the electron g-factor were extracted from the position of the spin zeros in tilted fields. A good agreement is obtained for the spin-orbit coupling strength from the spin-zeros and weak antilocalization measurements.