Regensburg 2019 – scientific programme
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DS: Fachverband Dünne Schichten
DS 14: Poster
DS 14.11: Poster
Tuesday, April 2, 2019, 17:00–20:00, Poster E
Tunable 2D electron gas at the LaAlO3/SrTiO3(001) interface — Igor Maznichenko1, •Sergey Ostanin1, Arthur Ernst2,3, and Ingrid Mertig1,2 — 1Institute for Physics, Martin Luther University Halle-Wittenberg, D-06099 Halle, Germany — 2Max Planck Institute of Microstructure Physics, Weinberg 2, D-06120 Halle, Germany — 3Institute for Theoretical Physics, Johannes Kepler University, Altenberger Straße 69, 4040 Linz, Austria
Currently, the formation of a two-dimensional electron gas (2DEG) at the TiO2/LaO-terminated interface of LaAlO3/SrTiO3 (LAO/STO) is well understood. The LAO critical thickness of four unit cells needed to measure the 2DEG was established. Here, we show how 2DEG can be tuned externally by changing electronic balance at the LAO(001) surface or, alternatively, at the intrinsically hole-doped AlO2/SrO interface of LAO/STO heterostructures. The effects of liquid gating at LAO(001) and imperfect AlO2/SrO were simulated in the framework of the first-principles Green function method within a coherent potential approximation. We evaluated the Fermi surface cross sections and effective masses of the 2DEG carriers, which were computed upon the degree of external chemical disorder. These findings may be extremely important for applications of 2DEG.