Abstract
We report magnetotransport properties of heterointerfaces between the Mott insulator and the band insulator 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 at low temperatures and its electric field dependence reflects the spatial distribution of the quasi-two-dimensional electron gas.
- Received 20 October 2010
DOI:https://doi.org/10.1103/PhysRevB.82.201407
©2010 American Physical Society