SKM 2023 – scientific programme

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DS: Fachverband Dünne Schichten

DS 12: Poster

DS 12.26: Poster

Wednesday, March 29, 2023, 17:00–19:00, P3

Charge-to-spin conversion in the quasi-two-dimensional electron gas emerging at the doped interface between LiNbO₃ and LaAlO₃ — •Igor Maznichenko^1,2, Sergey Ostanin¹, Ingrid Mertig¹, and Paweł Buczek² — ¹Institute of Physics, Martin Luther University Halle-Wittenberg, D-06099 Halle, Germany — ²Department of Engineering and Computer Sciences, Hamburg University of Applied Sciences, Berliner Tor 7, D-20099 Hamburg, Germany

We anticipate that the functional use of a solid electrolyte lithium niobate in LaAlO₃/LiNbO₃ heterostructure allows one to tune the quasi-two-dimensional electron gas (q2DEG) which emerges there. This phenomenon can be achieved by charging and discharging LiNbO₃. Here, on the basis of ab initio calculations of the hydrogen-doped LaAlO₃/LiNbO₃ interface, we demonstrate how the q2DEG and its spin polarization appear. The out-of-plane electric polarization of LaAlO₃/LiNbO₃ forces the H dopants to accommodate at the Al-terminated interface. This results in the formation of the q2DEG, whose spatial extent is about 1.5 nm along the stacking direction.