한현 박사의 세미나를 아래와 같이 안내드립니다.
구성원 여러분의 많은 참여 부탁드립니다.
Title: Electric-field control of emergent phenomena in correlated oxide thin films
Speaker: Dr. Hyeon Han (Max Planck Institute of Microstructure Physics)
Date: Nov. 16(Thu), 4pm
Place : E6-2(Natural Science B/D). 1st fl. #1323
[Zoom 회의 참가]
주제: 한현 박사 세미나
회의 ID: 849 5297 1197
Transition metal oxides (TMOs) have shown intriguing physical phenomena as their structures and physical properties are strongly intertwined. Electric-field control has emerged as a novel way to tailor the lattice symmetry and associated physical phenomena of the correlated TMOs [1-3]. Here, I will present the first realization of epitaxial growth of T-Nb2O5 thin films, critically with vertical ionic transport channels . This novel thin film form allows for a fast and colossal insulator-metal transition along with multiple hidden phase transitions, owing to the population of electrons in the initially empty Nb 4d level, via Li-ionic gating. This film further enables tunable and low voltage operation in ionic gating by chemical potential control between the gate electrode and T-Nb2O5 channel. In addition, by revealing time- and space-resolved electrokinetics during ionic gating, I will demonstrate a new concept of synchronized local ionic gating that allows local manipulation of electrical, magnetic, and optical properties in numerous nanostructures simultaneously . This concept enables the creation and control of all-oxide metamaterials, such as active metasurfaces in addition to artificial spin ices by collective interactions between nanostructures. Finally, I will present strongly correlated SrRuO3 thin films whose structure and physical properties can be extensively modified by external stimuli. In particular, the reversal of anomalous Hall effect coupled with octahedral tilting will be presented by the hydrogenation of SrRuO3 thin films . These studies pave a new way for electrically controlling lattice symmetry and emergent phenomena of TMOs and for their diverse potential applications.