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TT: Fachverband Tiefe Temperaturen

TT 106: Complex Oxides: Bulk Properties, Surfaces and Interfaces (joint session TT/MA/KFM)

TT 106.2: Talk

Friday, March 16, 2018, 09:45–10:00, H 0110

Anisotropic Rashba-type spin-orbit coupling of the two-dimensional electron system in (110) SrTiO₃-based heterostructures — •Karsten Wolff, Roland Schäfer, Robert Eder, Matthieu le Tacon, and Dirk Fuchs — Karlsruhe Institute of Technology, Institute for Solid State Physics

The two-dimensional electron system in (110) Al₂O_3−d/SrTiO₃ heterostructures displays anisotropic electronic transport. Structured microbridges allow to probe 4-point resistivity along different crystallographic orientations, i.e. [001] and [1-10]. The conductivity and electron mobility along the [001] direction is largest, while differences in sheet carrier concentration are only minor. The measurements show anisotropic normal magnetotransport for T < 30 K which is correlated to the anisotropic mobility. For temperatures below 5 K transport is dominated by Rashba-type spin orbit interaction (SOI) which displays anisotropic behavior, too. SOI is found largest along the [001] direction.