Regensburg 2013 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 31: Correlated Electrons: Low-Dimensional Systems -Materials 1

TT 31.8: Talk

Tuesday, March 12, 2013, 11:30–11:45, H41

Electronic Reconstruction in (001) and (111) oriented LaAlO₃/SrTiO₃ interfaces — •David Doennig and Rossitza Pentcheva — Department of Earth and Environmental Sciences, Section Crystallography and Center of Nanoscience, University of Munich, Theresienstr. 41, DE-80333 Munich, Germany

The observation of a quasi two-dimensional electron gas (q2DEG), superconductivity and magnetism at the (001) interface between the band insulators LaAlO₃ (LAO) and SrTiO₃ (STO) has opened possibilities for novel electronics applications. Based on density functional calculations, we explore if these multifunctional properties can be extended by changing the crystal orientation from (001) to (111). Despite the difference in stacking with AO and BO₂ planes of the perovskite ABO₃ structure in (001) oriented superlattices versus AO₃ and B layers in the (111) direction, analogous effects such as polar discontinuity arise when the A and B cations are varied across the interface. A further intriguing feature in (111) oriented interfaces is the formation of a buckled honeycomb lattice of the B-site cations. This lattice geometry, well known from graphene, promises to host even more exotic topological phases. The effect of interface termination, thickness of the substrate and strain will be discussed.

We acknowledge funding by the DFG, SFB/TR80.