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We have performed high field magnetotransport measurements to investigate theinterface electron gas in LaAlO3/SrTiO3 heterostructures. Shubnikov-de Haasoscillations reveal several 2D conduction subbands with carrier effectivemasses between 1 and 3 m_e, quantum mobilities of order 3000 cm^2/V s, and bandedges only a few millielectronvolts below the Fermi energy. Measurements intilted magnetic fields confirm the 2D character of the electron gas, and showevidence of inter-subband scattering.

Quantum oscillations and subband properties of the two-dimensional electron gas at the LaAlO3/SrTiO3 interface