Rashba Spin-Orbit Coupling Probed by the Weak Antilocalization Analysis in $\mathrm{InAlAs}/\mathrm{InGaAs}/\mathrm{InAlAs}$ Quantum Wells as a Function of Quantum Well Asymmetry

We have investigated the values of the Rashba spin-orbit coupling constant $\alpha$ in ${\mathrm{In}}_{0.52}{\mathrm{Al}}_{0.48}\mathrm{As}/{\mathrm{In}}_{0.53}{\mathrm{Ga}}_{0.47}\mathrm{As}/{\mathrm{In}}_{0.52}{\mathrm{Al}}_{0.48}\mathrm{As}$ quantum wells using the weak antilocalization (WAL) analysis as a function of the structural inversion asymmetry (SIA) of the quantum wells. We have found that the deduced $\alpha$ values have a strong correlation with the degree of SIA of the quantum wells as predicted theoretically. The good agreement between the theoretical and experimental values of $\alpha$ suggests that our WAL approach for deducing $\alpha$ values provides a useful tool in designing future spintronics devices that utilize the Rashba spin-orbit coupling.