# Experimental determination of Rashba and Dresselhaus parameters and $g^*$-factor anisotropy via Shubnikov-de Haas oscillations

## TL;DR

This study uses Shubnikov-de Haas oscillations in InGaAs/InP quantum wells to precisely measure Rashba and Dresselhaus spin-orbit coupling parameters and g-factor anisotropy, revealing dominant Rashba interaction and tensor anisotropies.

## Contribution

It introduces a method combining beating pattern analysis and tilted magnetic field measurements to determine spin-orbit parameters and g-tensor anisotropy in quantum wells.

## Key findings

- Rashba coefficient is large and dominates spin splitting.
- Dresselhaus coefficient is about 10% of Rashba.
- g-tensor shows significant out-of-plane anisotropy.

## Abstract

The spin splitting of conduction band electrons in inversion-asymmetric InGaAs/InP quantum wells is studied by Shubnikov-de Haas measurements combining the analysis of beating patterns and coincidence measurements in doubly tilted magnetic fields. The method allows us to determine the absolute values of the Rashba and linear Dresselhaus spin-orbit interaction coefficients, their relative sign and the full Land\'e g-tensor. This is achieved by analyzing the anisotropy of the beat node positions with respect to both polar and azimuthal angles between the magnetic field direction and the quantum well normal. We show that the spin-orbit interaction is dominated by a large Rashba coefficient together with a linear Dresselhaus coefficient that is 10 $\%$ of the Rashba coefficient. Their relative sign is found to be positive. The g-tensor is found to have a marked out-of-plane anisotropy and a smaller but distinct in-plane anisotropy due to spin-orbit interaction.