A5100444562- Advanced Condensed Matter Physics
- Magnetic and transport properties of perovskites and related materials
- Multiferroics and related materials
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Thermal Expansion and Ionic Conductivity
- Physics of Superconductivity and Magnetism
- 2D Materials and Applications
- Advanced Thermoelectric Materials and Devices
- Superconducting Materials and Applications
- Magnetic confinement fusion research
- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Graphene research and applications
- Ferroelectric and Piezoelectric Materials
- Thermal properties of materials
- GaN-based semiconductor devices and materials
- Rare-earth and actinide compounds
- Transition Metal Oxide Nanomaterials
- Nuclear Materials and Properties
- Perovskite Materials and Applications
- Nuclear Physics and Applications
- Carbon Nanotubes in Composites
- Advanced Memory and Neural Computing
- Metal and Thin Film Mechanics
European Society of Cardiology
2024
Samsung Medical Center
2008-2024
Sungkyunkwan University
2008-2024
High Energy Accelerator Research Organization
2012-2023
Seoul National University
2004-2023
Osaka University
2018-2023
LG Chem (South Korea)
2021
Florida State University
2021
Okinawa Institute of Science and Technology Graduate University
2020
The University of Tokyo
2020
Multiferroic materials have attracted much interest due to the unusual coexistence of ferroelectric and (anti-)ferromagnetic ground states in a single compound. They offer an exciting platform for new physics potentially novel devices. BiFeO$_3$ is one most celebrated multiferroic with highly desirable properties. It only known room-temperature $T_\mathrm{C}\approx 1100~ \mathrm{K}$ $T_\mathrm{N}\approx 650~\mathrm{K}$, exhibits largest spontaneous electric polarisation, $P\approx...
Abstract Chemical doping is one of the most important strategies for tuning electrical properties semiconductors, particularly thermoelectric materials. Generally, main role chemical lies in optimizing carrier concentration, but there can potentially be other effects. Here, we show that plays multiple roles both electron and phonon transport half-Heusler With ZrNiSn-based materials as an example, use high-quality single polycrystalline crystals, various probes, including measurements,...
Ferromagnetism in two-dimensional materials presents a promising platform for the development of ultrathin spintronic devices with advanced functionalities. Recently discovered ferromagnetic van der Waals crystals such as CrI3, readily isolated crystals, are highly tunable through external fields or structural modifications. However, there remains challenge because material instability under air exposure. Here, we report observation an air-stable and layer-dependent (FM) crystal, CrPS4,...
The human cytomegalovirus (HCMV) clinical strain Toledo and the attenuated AD169 exhibit a striking difference in pathogenic potential cell tropism. virulent genome contains 15-kb segment, which is present all strains but absent from genome. differences between 2 are thought to be associated with this additional segment. Cytokines induced during viral infection play major roles regulation of cellular interactions involving cells immune inflammatory systems consequently determine outcome...
The neutron instruments suite, installed at the spallation source of Materials and Life Science Experimental Facility (MLF) Japan Proton Accelerator Research Complex (J-PARC), is reviewed. MLF has 23 beam ports 21 are in operation for user programs or under commissioning. A unique challenging instrumental suite been realized via combination a high-performance source, optimized scattering, using cutting-edge technologies. All are/will serve world-leading investigations broad range fields,...
How magnetoelectric coupling actually occurs on a microscopic level in multiferroic BiFeO${}_{3}$ is not well known. By using high-resolution single crystal neutron diffraction techniques, we have determined the electric polarization of each individual element BiFeO${}_{3}$, and concluded that magnetostrictive suppresses at Fe site below ${T}_{N}$. This negative appears to outweigh spin current contributions arising from cycloid structure, which should produce positive coupling.
Perovskite PbCoO3 synthesized at 12 GPa was found to have an unusual charge distribution of Pb2+Pb4+3Co2+2Co3+2O12 with orderings in both the A and B sites perovskite ABO3. Comprehensive studies using density functional theory (DFT) calculation, electron diffraction (ED), synchrotron X-ray (SXRD), neutron powder (NPD), hard photoemission spectroscopy (HAXPES), soft absorption (XAS), measurements specific heat as well magnetic electrical properties provide evidence lead ion cobalt ordering...
Competition between ferromagnetic and antiferromagnetic phases on frustrated lattices in hexagonal Laves phase compound ${\mathrm{Hf}}_{0.86}{\mathrm{Ta}}_{0.14}{\mathrm{Fe}}_{2}$ is investigated by using neutron diffraction as a function of temperature magnetic fields density-functional-theory calculations. At 325 K, the orders into ${120}^{\ensuremath{\circ}}$ state with well-reduced moment, an in-plane lattice contraction simultaneously sets in. With further cooling down, however,...
We report new magnetic heat capacity measurements of a high quality single crystal the dipole-octupole pyrochlore Ce$_2$Hf$_2$O$_7$ down to temperature $T = 0.02$ K, factor three lower than those previously reported. These show two-peaked structure, with Schottky-like peak at $T_1 \sim 0.065$ similar what is observed in its sister Ce-pyrochlores Ce$_2$Zr$_2$O$_7$ and Ce$_2$Sn$_2$O$_7$. However second, sharper $T_2 0.025$ which signifies entrance ground state, as even most abrupt...
Li2MnO3 consists of a layered Mn honeycomb lattice separated by single layer LiO6 octahedra along the c-axis. By using crystal samples, we have examined physical properties and carried out both powder neutron diffraction studies to determine that moments order antiferromagnetically at TN = 36 K with an ordered magnetic moment 2.3 μB perpendicular ab plane. We also discovered about 35% full entropy is released in supposedly simple paramagnetic phase, indicative unusual spin dynamics higher...
Color-selective or wavelength-tunable capability is a crucial feature for two-dimensional (2-D) semiconducting material-based image sensor applications. Here, we report on flexible and wavelength-selective molybdenum disulfide (MoS2) phototransistors using monolithically integrated transmission Fabry-Perot (F-P) cavity filters. The fabricated multilayer MoS2 polyarylate substrate exhibit decent electrical characteristics (μFE > 64.4 cm2/Vs, on/off ratio 106), the F-P filters, being able to...
Abstract When an electronic system has strong correlations and a large spin-orbit interaction, it often exhibits plethora of mutually competing quantum phases. How particular ground state is selected out several possibilities very interesting question. However, equally fascinating how such entangled breaks up due to perturbation. This important question relevance in diverse fields science from strongly correlated electron physics information. Here we report that dimerized or valence bond...
Abstract Catechol O-methyltransferase (COMT) is widely distributed in nature and installs a methyl group onto one of the vicinal hydroxyl groups catechol derivative. Enzymes belonging to this family require two cofactors for transfer: S-adenosyl-l-methionine as donor divalent metal cation regiospecific binding activation substrate. We have determined high-resolution crystal structures Rv0187, three COMT paralogs from Mycobacterium tuberculosis , presence absence cofactors. The cofactor-bound...
Vertically conformal ZnO/CuO core–shell nanowire (NW) arrays with high aspect ratios were synthesized by electrophoresis-assisted electroless deposition (EAELD) of CuO onto preformed ZnO NWs. Using this method, seeds successfully formed on long NWs the electrostatic attachment colloidal Cu2O NPs under solution and subsequent thermal oxidation. seeds, shell to core fabricated kinetic-limited in solution, which overcame inherent diffusion limitations conventional deposition. This experimental...
We report an investigation of the electronic structure crystalline InGaZnO (IGZO) using X-ray absorption spectroscopy (XAS) and ab initio density functional theory calculations. The properties conduction band vary significantly with composition InGaZnO4 In2Ga2ZnO7, this is strongly correlated XAS spectra. Detailed analyses orbital character reveal crystal field splitting under characteristic local structural distortions ZnO5 coordinate bonds, which breaks In p/d degeneracy preferentially...
Materials that show negative thermal expansion (NTE) have significant industrial merit because they can be used to fabricate composites whose dimensions remain invariant upon heating. In some materials, NTE is concomitant with the spontaneous magnetization due magnetovolume effect (MVE). Here authors report a new class of MVE material; namely, layered perovskite PrBaCo2 O5.5+x (0 ≤ x 0.41), in which strong [β ≈ -3.6 × 10-5 K-1 (90-110 K) at = 0.24] triggered by embedding ferromagnetic (F)...
Abstract The photoresponsivity of a MoS 2 phototransistor is limited owing to its low light absorption. Many studies aiming improve the have enhanced absorption in by optical resonance or integrating an absorbing layer. However, light‐absorbing overlayer changes spectral and forms leakage path. In this study, multilayer obtained localized Au/MoS Schottky junctions without overlayer. Au disks are formed on surface using simple spherical‐lens photolithography technique, forming between disks....
We report long periodic chiral helimagnetic orderings in ferromagnetic inorganic compounds CrM3S6 (M = Nb and Ta) with a space group of P6322. Magnetization polycrystalline samples high resolution powder neutron diffraction were measured. Our measurements successfully separated nuclear magnetic satellite peaks, having the period hundreds angstroms along c— axis. Therefore, we propose that ordering is not ferromagnetic, but ordering.
This study presents the first chromosome-level genome assembly of Hanwoo, an indigenous Korean breed Bos taurus taurus. is Asian breed. Also, we constructed a pangenome graph 14 B. assemblies. The contig N50 was over 55 Mb, scaffold 89 Mb and completeness 95.8%, as estimated by BUSCO using mammalian set, indicated high-quality assembly. 48.7% comprised various repetitive elements, including DNAs, tandem repeats, long interspersed nuclear simple repeats. A total 27,314 protein-coding genes...