Quantum oscillations and subband properties of the two-dimensional   electron gas at the LaAlO3/SrTiO3 interface
  We have performed high field magnetotransport measurements to investigate the interface electron gas in LaAlO3/SrTiO3 heterostructures. Shubnikov-de Haas oscillations reveal several 2D conduction subbands with carrier effective masses between 1 and 3 m_e, quantum mobilities of order 3000 cm^2/V s, and band edges only a few millielectronvolts below the Fermi energy. Measurements in tilted magnetic fields confirm the 2D character of the electron gas, and show evidence of inter-subband scattering. 
A. McCollam, S. Wenderich, M. K. Kruize, V. K. Guduru, H. J. A.   Molegraaf, M. Huijben, G. Koster, D. H. A. Blank, G. Rijnd...
cond-mat.mtrl-sci cond-mat.str-el