아래와 같이 세미나 일정을 안내드리니 많은 관심과 참석을 바랍니다

일시: 12월 11일 오전 10시30분 ~ 

장소: 제1물리관 105-2호 

연사: Hanjong Paik (University of Oklahoma) 

연제: Advancing the Frontiers of Complex Oxide Epitaxy via Lattice-Symmetry and Substrate Design 

초록: omplex oxide thin films serve as a versatile platform for exploring electronic, magnetic, and optical functionalities. Advances in epitaxial growth via physical vapor deposition have highlighted the critical role of substrate design and lattice-symmetry engineering in controlling strain, symmetry, and defect density. High-mobility wide-bandgap perovskite oxides such as La-BaSnO3 and La-SrSnO3 have been realized on newly synthesized lattice-matched substrates, including (La,Nd)(Lu,Sc)O3, Sr2DyNbO6, Ba2ScNbO6, and LaLuO3, enabling precise tuning of defect density and structural perfection.1,2 Pyrochlore oxides grown on engineered pyrochlore substrates, including Sm₂Ti₂O? and Eu₂Ti₂O?, provide platforms for catalysis, correlated electron phenomena, and magnetic studies, demonstrating the potential of kagome lattice matching in stabilizing complex correlated structures.3,4 Rutile oxides, particularly VO₂, have been tried on non-commercial mineral substrates such as topaz Al2SiO4(F,OH)2 and mullite Al6Si2O13 to manipulate metal?insulator transitions, and exploration of rutile GeO₂ substrates offers access to metastable phases such as MnO₂ and PtO₂, as well as ambipolar doping in ultra-wide-bandgap films predicted by theory.5,6 Magnetic hexagonal oxides, including BaFe₁₂O₁?, grown on complex hexagonal SGMZ substrates7 enable spin current?ferromagnetism proximity effects and functional integration with other material systems, including 2D TMDs. These strategies extend to CMOScompatible platforms, where epitaxial hexagonal oxides and ferrites are integrated on Si (111) wafers, providing pathways for scalable oxide electronics and multifunctional heterostructures. Collectively, these approaches demonstrate how substrate design and lattice-symmetry control, combined with precise thin-film deposition, expand the functional landscape of complex oxides and enable new directions for material property engineering and device integration.