The quasi-two-dimensional electron gas found at the LaAlO3/SrTiO3 interface offers exciting new functionalities, such as tunable superconductivity, and has been proposed as a new nanoelectronics fabrication platform. Here we lay out a new example of an electronic property arising from the interfacial breaking of inversion symmetry, namely a large Rashba spin-orbit interaction, whose magnitude can be modulated by the application of an external electric field. By means of magnetotransport experiments we explore the evolution of the spin-orbit coupling across the phase diagram of the system. We uncover a steep rise in Rashba interaction occurring around the doping level where a quantum critical point separates the insulating and superconducting ground states of the system.
@article{arxiv.0912.3731,
title = {Tunable Rashba spin-orbit interaction at oxide interfaces},
author = {A. D. Caviglia and M. Gabay and S. Gariglio and N. Reyren and C. Cancellieri and J. -M. Triscone},
journal= {arXiv preprint arXiv:0912.3731},
year = {2015}
}