Exploring the two-dimensional electron gas at TiO2/LaAlO3 interface usingadvanced electron microscopy techniques

In recent years, a lot of research has been performed on transition metal oxides, because of their fascinatingbehaviour at heterostructural interfaces. Arising phenomena, like the formation of two-dimensional electrongas (2DEG) with high charge densities make such systems interesting for potential technical applications.Although the integration of such oxide interfaces on top of silicon [1] or the writing of 2 nm width nanowiresonto STO/LAO interface with biased atomic force microscopy [2] have been achieved, the physical origin of the2DEG is still highly discussed. It is often attributed to polar discontinuity at the interface or oxygen vacancies.However, a fully characterization and understanding of the oxide interfaces is unavoidable to apply themreliable at electronic devices and be able to tune their electric properties.