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Two-dimensional electron gas in δ-doped SrTiO3
Published Web Location
http://link.aps.org/doi/10.1103/PhysRevB.82.081103Abstract
It is shown that Shubnikov-de Haas oscillations in SrTiO3 δ-doped with La can be understood as arising from a two-dimensional electron gas of one subband immersed in the space charge layer. Despite the inherent complexity of a subband that is derived from four d-band states near the conduction-band minimum of SrTiO3, the quantum oscillations can be modeled quantitatively by recognizing that the magnetic field (B) induced effective spin splitting and Landau-level splitting are comparable. The oscillations are not strictly periodic in 1/B, which can be understood as caused by a weak dependence of the electron density on the magnetic field in the subband that produces the observed oscillations.
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