A5101964160- Advanced Chemical Physics Studies
- Machine Learning in Materials Science
- nanoparticles nucleation surface interactions
- Advanced Condensed Matter Physics
- Advanced Thermodynamics and Statistical Mechanics
- Physics of Superconductivity and Magnetism
- Advanced Materials Characterization Techniques
- Spectroscopy and Quantum Chemical Studies
- Advanced Electron Microscopy Techniques and Applications
- Rare-earth and actinide compounds
- Electronic and Structural Properties of Oxides
- Magnetic and transport properties of perovskites and related materials
- 2D Materials and Applications
- Seismic Imaging and Inversion Techniques
- Catalytic Processes in Materials Science
- Electrocatalysts for Energy Conversion
- Topological Materials and Phenomena
- Perovskite Materials and Applications
Seoul National University
1996-2021
Institute for Basic Science
2018-2021
We investigate the hidden Berry curvature in bulk 2H-WSe2 by utilizing surface sensitivity of angle resolved photoemission (ARPES). The symmetry electronic structure transition metal dichalcogenides is used to uniquely determine local orbital angular momentum (OAM) contribution circular dichroism (CD) ARPES. extracted CD signals for K and K' valleys are almost identical but their signs, which should be determined valley index, opposite. In addition, sign found same two spin-split bands,...
In spectroscopic experiments, data acquisition in multi-dimensional phase space may require long time, owing to the large volume be covered. such a case, limited time available for can serious constraint experiments which multidimensional spectral are acquired. Here, taking angle-resolved photoemission spectroscopy (ARPES) as an example, we demonstrate denoising method that utilizes deep learning intelligent way overcome constraint. With readily ARPES and random generation of training...
Using angle-resolved photoemission spectroscopy, we show direct evidence for charge transfer between adsorbed molecules and metal substrates, i.e., chemisorption of CO on Pt(111) Pt–Sn/Pt(111) 2 × surfaces. The observed band structures a unique signature as atoms are adsorbed, revealing the roles specific orbital characters participating in process. As coverage increases, degree Pt shows clear difference to that Pt–Sn. With comparison density functional theory calculation results, distinct...
We discuss a few examples of cases in which the widely used mean-field approaches to alloys and alloy superlattices may not give complete solutions. These include anomalously large Stokes anti-Stokes real space-charge transfer over thick barriers spatial extent optical phonons superlattices, have remained unsolved or controversial. argue, both theoretically experimentally, that fully account for inhomogeneities, partial ordering, disorder effects as well proper understanding coupled...
We studied the electronic band structure of pulsed laser deposition (PLD) grown (111)-oriented ${\mathrm{SrRuO}}_{3}$ thin films using in situ angle-resolved photoemission spectroscopy technique. observed light bands with a renormalized quasiparticle effective mass about $0.8{m}_{e}$. The electron-phonon coupling underlying this renormalization yields characteristic ``kink'' dispersion. self-energy analysis Einstein model suggests five optical phonon modes covering an energy range 44--90 meV...
The heavy fermion state with Kondo-hybridization (KH), usually manifested in f-electron systems lanthanide or actinide elements, was recently discovered several 3d transition metal compounds without f-electrons. However, KH has not yet been observed 4d/5d compounds, since more extended orbitals do form flat bands that supply localized electrons appropriate for Kondo pairing. Here, we report a doping- and temperature-dependent angle-resolved photoemission study on 4d Ca2-xSrxRuO4, which shows...
Using angle-resolved photoemission spectroscopy, we show the direct evidence of charge transfer between adsorbed molecules and metal substrate, i.e. chemisorption CO on Pt(111) Pt-Sn/Pt(111) 2x2 surfaces. The observed band structure shows a unique signature as atoms are adsorbed,revealing roles specific orbital characters participating in process. As coverage increases, degree Pt clear difference to that Pt-Sn. With comparison DFT calculation results, distinct features interpreted...