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4시 20분부터 제1과학관 31214 e+강의실에서 간단한 다과를 제공합니다.

아 래

Title: First-principles studies of complex oxides interfaces

Speaker: 이  재  광 교수님 (부산대학교 물리학과)

Date & Time: Dec. 12. (Wed.) 2018 4:30 PM

Place: Natural Science 1,  Room No. 31214

Abstract: The Oxide interfaces have attracted considerable attention in recent years due to emerging novel properties that do not exist in the corresponding parent compounds. Furthermore, modern atomic-scale growth and probe techniques enable the formation and study of new artificial interface states distinct from the bulk state. A central issue in understanding the novel phenomena in oxide heterostructures is to reveal how various physical variables (spin, charge, lattice and/or orbital hybridization) interact with each other at the atomic scale. Recently, unlike strongly localized two-dimensional electron gas (2DEG) in LAO/STO (001) heterostructure, a wide n-type 2DEG distribution is observed at the LAO/STO (111) interface. According to the polar catastrophe scenario, the LAO/STO (111) interface consisting of [Ti]4+ and [LaO3]3- layers is expected to exhibit the highly localized p-type characteristics. Despite these controversies, the origin of n-type 2DEG at the LAO/STO (111) interface has not been clearly revealed yet. Here, using density functional theory calculations, we find that the n-type 2DEG originates from extra electrons created by the oxygen vacancy in the [[LaO3]3- terminated LAO (111) surface, and these excess oxygen vacancies significantly modulate the relative displacements between La and oxygen atoms in LAO layers. Our theoretical studies help understanding how physical variables couple with each other and how they develop novel functionalities at various oxide interfaces.

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