visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2024-01-26 15:00 
일시 2024.01.26(Fri) 3:00pm 
장소 E6-2 #1323 
연사 :Prof. Sang Ho Oh (Department of Energy Engineering, Korea Institute of Energy Technology) 
물리학과 구성원분들께,
아래와 같이 세미나를 개최하오니 많은 참석 부탁드립니다.
 
- Speaker : Prof. Sang Ho Oh (Department of Energy Engineering, KENTECH Institute for Energy Materials and Devices, Korea Institute of
                Energy Technology)
- Date : 2024.01.26(Fri) 3:00pm
- Place : E6-2  #1323
- Title : "In-situ 4D-STEM studies on surface reconstruction and polarization switching of perovskite oxides"
- Abstract : 
4D STEM is an emerging technique in electron microscopy, enabling the acquisition of convergent electron beam diffraction (CBED) patterns in every pixels in STEM mode. This technique is versatile and finds many useful applications in materials science, where conventional TEM and STEM techniques are unable to characterize. For example, the quantitative interpretation of the CBED pattern can provide detailed information on the crystal symmetry and atomic positions at an Å level, allowing the precise determination of lattice strain and atomic displacement. 4D STEM data, acquired at an optimized condition for ptychography and treated by iterative phase reconstruction algorithms, can be used for atomic-scale potential and charge density mapping. Further, the ptychography of 4D STEM can achieve a good depth resolution in the range of ~2-5 nm once the multislice wave propagation is incorporated into the iterative phase reconstruction process. If all these capabilities of 4D STEM is combined with in-situ TEM experiments, such as heating and electrical biasing, tremendous breakthrough can made in various fields of materials science and solid-state physics. In this seminar, some of our recent (unpublished) works on the surface reconstruction of SrTiO3 (001) at high temperatures and the mapping of field-induced polarization switching of relaxor ferroelectric Ba0.5Sr0.5TiO3 thin films will be presented. 
번호 날짜 장소 제목
259 2015-12-03 16:00  E6-2, #1323  Hybrid solid state spin qubits in wide bandgap semiconductors
258 2015-11-24 16:00  E6-2, #1323  Topology-based understanding of spin dynamics in inhomogeneously magnetized systems
257 2015-11-23 13:30  E6-2, #1323  What's Beyond the Standard Model? Lessons from Run I and what might come in Run II
256 2015-11-28 10:00  E6-2, #1323  Electron Tunneling Spectroscopy of Single and Bilayer Graphene with Hexagonal Boron Nitride as Tunneling Barrier
255 2015-12-01 16:00  E6-2, #1323  Introducing extra dimensions to spectroscopic studies of advanced quantum materials
254 2015-12-11 13:30  E6-2, #1323  Quantum spin liquid in the 1/3 depleted triangular lattice Ba3(Ru1-xIrx)Ti2O9
253 2015-12-11 15:45  E6-2, #1323  Dynamical mean field theory studies on heavy fermion system
252 2016-01-11 16:00  E6-2, #1323  Mott Physics in the Strong Spin-Orbit Coupling Regime
251 2016-01-26 14:00  E6-2, #1323  Electrochemistry on Nano- and Atomic Levels: Scanning Probe Microscopy Meets Deep Data
250 2016-09-29 16:00  E6-2, #1323  2016 Fall, Physics Seminar Serises file
249 2019-06-24 11:00  E6-2, #1323  Topological photonic anomalies file
248 2019-07-25 16:00  E6-2, #1323  Band topology of twisted bilayer graphene file
247 2019-07-31 16:00  E6-2, #1323  Features of ballistic superconducting graphene file
246 2022-09-15 13:00  E6-2, #1323  AdS black holes: a review
245 2023-07-12 11:00  E6-2, #1323  Study of spin-1/2 antiferromagnetic kagome Heisenberg model by symmetric projected entangled simplex states
244 2023-07-11 11:00  E6-2, #1323  Ordered phases, non-Fermi liquid, and quantum criticality driven by entanglement between multipoles and conduction electrons
243 2023-07-19 16:00  E6-2, #1323  [High-Energy Theory Seminar]Deriving the Simplest Gauge-String Duality
242 2023-07-18 11:00  E6-2, #1323  Non-Hermitian Casimir Effect of Magnons
241 2023-12-19 16:00  E6-2, #1323  [High Energy Theory Seminar] Non-invertible symmetries, leptons, quarks, and why multiple generations
240 2024-01-03 11:00  E6-2, #1323  Interplay of Strong Correlations, Topology, and Disorder in 2D Quantum Matters