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arxiv: 1207.7003 · v1 · pith:LMUDA3QNnew · submitted 2012-07-30 · ❄️ cond-mat.mtrl-sci · cond-mat.str-el

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

A. McCollam , S. Wenderich , M. K. Kruize , V. K. Guduru , H. J. A. Molegraaf , M. Huijben , G. Koster , D. H. A. Blank
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G. Rijnders A. Brinkman H. Hilgenkamp U. Zeitler J. C. Maan
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classification ❄️ cond-mat.mtrl-sci cond-mat.str-el
keywords electroninterfacelaalo3measurementsoscillationsquantumsrtio3band
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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.

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