Speaker
Mrs
Amany Raslan
(Department of Physics and Astronomy, Trent University, Peterborough Ontario, Canada, K9J 7B8)
Description
Experiments have observed a two-dimensional electron gas at the interface of two insulating oxides: strontium titanate ($\mathrm{SrTiO_3}$) and lanthanum aluminate ($\mathrm{LaAlO_3}$).
These interfaces exhibit metallic, superconducting, and magnetic behaviours, which are strongly affected by impurities.
We introduce a simple model to study the two-dimensional conductivity at $\mathrm{LaAlO_{3}/SrTiO_{3}}$ interfaces.
Motivated by experiments, we assume that impurities lie at the interface and their density is low.
In our model, we treat the $\mathrm{LaAlO_3}$ as an insulator and model the $\mathrm{SrTiO_3}$ film.
By solving a set of self-consistent Hartree equations for the charge density, we obtain the band structure of the $\mathrm{SrTiO_3}$ film.
We then study the relative contributions made by the occupied bands to the two-dimensional conductivity of the $\mathrm{LaAlO_3/SrTiO_3}$ interface.
We find that the fractional conductivity of each band depends on several parameters: the mass anisotropy, the filling, and the impurity potential.
Primary author
Mrs
Amany Raslan
(Department of Physics and Astronomy, Trent University, Peterborough Ontario, Canada, K9J 7B8)
Co-author
Prof.
W. A. Atkinson
(Department of Physics and Astronomy, Trent University, Peterborough Ontario, Canada, K9J 7B8)
