  Transport properties of the complex oxide LaAlO3/SrTiO3 interface are
investigated under high magnetic field (55T). By rotating the sample with
respect to the magnetic field, the two-dimensional nature of charge transport
is clearly established. Small oscillations of the agnetoresistance with altered
periodicity are observed when plotted versus inverse magnetic field. We
attribute this effect to Rashba spin-orbit coupling which remains consistent
with large negative magnetoresistance when the field is parallel to the sample
plane. A large inconsistency between the carrier density extracted from
Shubnikov-de Haas analysis and from the Hall effect is explained by the
contribution to transport of at least two bands with different mobility.
