Regensburg 2022 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 18: Thin Oxides and Oxide Layers 1

DS 18.3: Vortrag

Mittwoch, 7. September 2022, 15:30–15:45, H14

Soft RIXS study of alumina-titania thin films heterostructure to reveal the nature of 2-dimensional electron system — •Deok-Yong Cho — Department of Physics, Jeonbuk National University, South Korea

Al2O3/TiO2 binary oxide heterostructure is a novel 2-dimensional electron system (2DES) compatible with mass production. The electronic structure of the 2DES was examined using resonant inelastic soft X-ray scattering. The TiO2 thickness-dependent evolution in the Ti L3-edge energy loss features unequivocally evidenced the presence of Ti3+ state at the interface and a substantial electron-phonon coupling effects. This suggests that the 2DES properties can be controlled via well-established TiO2 engineering so that the binary oxide heterostructure would be a promising candidate for 2DES-based device application.

This work was done in collaboration with Yu-Cheng Shao, Cheng-Tai Kuo, Xuefei Feng and Yi-De Chuang (Advanced Light Source, USA), and Tae Jun Seok, Ji Hyeon Choi and Tae Joo Park (Hanyang University, South Korea). DOI: 10.1002/adfm.202104430