Nonlinear Hall effect and multichannel conduction in LaTiO3/SrTiO3 superlattices

Details Nonlinear Hall effect and multichannel conduction in LaTiO3/SrTiO3 superlattices Nonlinear Hall effect and multichannel conduction in LaTiO3/SrTiO3 superlattices

2010-04-05

arxiv.org/abs/1004.0660v1

Physics

Condensed Matter

Strongly Correlated Electrons

23 pages, 4 figures in the main text, 6 figures in the Supplementary Information

Scientific paper

We report magneto-transport properties of heterointerfaces between the Mott insulator LaTiO3 and the band insulator SrTiO3 in a delta-doping geometry. At low temperatures, we have found a strong nonlinearity in the magnetic field dependence of the Hall resistivity, which can be effectively controlled by varying the temperature and the electric field. We attribute this effect to multichannel conduction of interfacial charges generated by an electronic reconstruction. In particular, the formation of a highly mobile conduction channel revealed by our data is explained by the greatly increased dielectric permeability of SrTiO3 at low temperatures, and its electric-field dependence reflects the spatial distribution of the quasi-two-dimensional electron gas.

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