Determining the Rashba parameter from the bilinear magnetoresistance response in a two-dimensional electron gas
D. C. Vaz, F. Trier, A. Dyrdał, A. Johansson, K. Garcia, A. Barthélémy, I. Mertig, J. Barnaś, A. Fert, M. Bibes
Abstract
The Rashba spin-orbit coupling is a relativistic interaction appearing in systems lacking inversion symmetry such as surfaces or interfaces. It locks the electrons' spin and angular momentum and enables efficient means to interconvert spin currents and charge currents through the direct and inverse Edelstein effects. The Rashba coefficient sets the amplitude of the Rashba spin-orbit coupling but its quantification, using for instance angle-resolved photoemission spectroscopy, is very challenging. The authors demonstrate that the Rashba coefficient can be reliably extracted from a simple magnetotransport experiment and apply it to LaAlO${}_{3}$/SrTiO${}_{3}$ interfaces for a broad range of Fermi energies, tuned by an electrostatic gate.