2014 CAP Congress / Congrès de l'ACP 2014

Two-dimensional conductivity at LaAlO3/SrTiO3 interfaces

18 Jun 2014, 14:30

15m

C-204 (Laurentian University / Université Laurentienne)

Oral (Student, In Competition) / Orale (Étudiant(e), inscrit à la compétition) Condensed Matter and Materials Physics / Physique de la matière condensée et matériaux (DCMMP-DPMCM) (W2-1) Low Dimensional Systems - DCMMP / Systèmes de basse dimension - DPMCM

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 ${\mathrm{LaAlO}}_3/{\mathrm{SrTiO}}_3$ 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 ${\mathrm{LaAlO}}_3/{\mathrm{SrTiO}}_3$ interface. We find that the fractional conductivity of each band depends on several parameters: the mass anisotropy, the filling, and the impurity potential.

Presentation materials

Slides

Amany_CAP__Seminar.pdf