Berlin 2018 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 27: Postersession KFM
KFM 27.5: Poster
Donnerstag, 15. März 2018, 15:00–17:00, Poster E
Anisotropic Transport of the 2D Electron System in (001) Al2O3−d/SrTiO3 Heterostructures — •Karsten Wolff1, Roland Schäfer1, Richard Thelen2, Matthias Meffert3, Dagmar Gerthsen3, Rudolf Schneider1, and Dirk Fuchs1 — 1Karlsruher Institut für Technology, Institut für Festkörperphysik — 2Karlsruher Institut für Technology, Institut für Mikrostrukturtechnik — 3Karlsruher Institut für Technology, Laboratorium für Elektronenmikroskopie
Transport measurements on the two-dimensional electron system in Al2O3/SrTiO3 heterostructures indicate significant non-crystalline anisotropic behavior below T ≈ 30 K. Lattice dislocations in SrTiO3 and interfacial steps are suggested to be the main sources for electronic anisotropy in (001) oriented heterostructures. Anisotropic defect scattering likewise alters magnetoresistance at low temperature remarkably and influences spin-orbit coupling significantly by the Elliot-Yafet mechanism of spin relaxation resulting in anisotropic weak localization. Applying a magnetic field parallel to the interface results in an additional field-induced anisotropy of the magnetoconductance, which can be attributed to Rashba spin-orbit interaction.