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Two Dimensional Electron Gas At Oxide Interfaces, Karolina Janicka
Two Dimensional Electron Gas At Oxide Interfaces, Karolina Janicka
Department of Physics and Astronomy: Dissertations, Theses, and Student Research
Extraordinary phenomena can occur at the interface between two oxide materials. A spectacular example is a formation of a two-dimensional electron gas (2DEG) at the SrTiO3/LaAlO3 interface. In this dissertation the properties of the 2DEG are investigated from first principles.
The spatial extent of the 2DEG formed at the SrTiO3/LaAlO3 n-type interface is studied. It is shown that the confinement of the 2DEG is controlled by metal induced gap states formed in the band gap of SrTiO3. The confinement width is then determined by the attenuation length of the metal induced gap …
Functional Two-Dimensional Electronic Gases At Interfaces Of Oxide Heterostructures, Yong Wang
Functional Two-Dimensional Electronic Gases At Interfaces Of Oxide Heterostructures, Yong Wang
Department of Physics and Astronomy: Dissertations, Theses, and Student Research
A quasi-two dimensional electron gas (2DEG) in oxide heterostructures such as LaAlO3/SrTiO3 has unique properties that are promising for applications in all-oxide electronic devices. In this dissertation, we focus on understanding and predicting novel properties of the 2DEG by performing first-principles electronic calculations within the frame work of density-functional theory (DFT).
The effects of polarization in all-oxide heterostructures incorporating different ferroelectric constituents, such as KNbO3/ATiO3 (A = Sr, Ba, Pb), are investigated. It is found that screening charge at the interface that counteracts the depolarizing electric field in the ferroelectric material significantly changes the …