A5025808294- Advanced Condensed Matter Physics
- Physics of Superconductivity and Magnetism
- Magnetic and transport properties of perovskites and related materials
- Superconductivity in MgB2 and Alloys
- Antenna Design and Analysis
- Advanced Antenna and Metasurface Technologies
- Topological Materials and Phenomena
- Metallurgy and Material Forming
- Advanced Data Storage Technologies
- High voltage insulation and dielectric phenomena
- Laser-Matter Interactions and Applications
- Quantum many-body systems
- ZnO doping and properties
- Microstructure and mechanical properties
- Optical Network Technologies
- Plasma Diagnostics and Applications
- Electronic and Structural Properties of Oxides
- Iron-based superconductors research
- Advanced Fiber Laser Technologies
- Theoretical and Computational Physics
- Transportation Safety and Impact Analysis
- Microwave Engineering and Waveguides
- Spectroscopy and Laser Applications
- Photonic and Optical Devices
- Microstructure and Mechanical Properties of Steels
Pohang University of Science and Technology
2001-2024
Korea Foundation for Max Planck POSTECH
2023-2024
Korea Post
2014
We investigated the electronic structure of Na${}_{2}$IrO${}_{3}$ using optical spectroscopy, first-principles calculation, and x-ray absorption spectroscopy. found that is mainly determined by anisotropic hopping interactions spin-orbit coupling. Due to interaction, orbital character bands near Fermi level deviates from coupling-induced ${J}_{\mathrm{eff}}$ $=$ 1/2 states. Polarization-dependent O 1$s$ spectroscopy showed state an Ir atom can be mixed with 3/2 neighboring atom. This result...
A composite frequency‐selective surface (FSS) fabricated by using an e‐beam evaporator is proposed. This manufacturing process advantageous in that it can directly achieve FSS function for real structural surfaces with various skin conformations. multilayered patch–grid–patch‐type consisting of copper layers as capacitive or inductive and a glass/epoxy prepreg the substrate produced. It operates at 9–10 GHz dual polarisation. technique be used to manufacture stealth technology communicating...
High-order harmonics (HOHs) spectroscopy is attracting the attention of condensed matter community, mostly because HOHs spectrum encode material property. Topological materials are interest for both basic research and advanced technologies their robust properties against dissipation perturbations. Floquet engineering technique have been demonstrated to be a unique tool manipulate topological phase. In this paper, we apply HOH characterize state via circular dichroism (CD). We find that CD...
Abstract We propose the generation of a widely tunable UV-to-IR frequency comb by high-order sideband (HSB) spectrum emitted from semiconductors. In our theoretical simulations, we demonstrate signals two series (2 m <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mi mathvariant="normal">Ω</mml:mi> <mml:mi>seed</mml:mi> </mml:msub> </mml:math> + n 1) <mml:mi>ω</mml:mi> <mml:mi>driver</mml:mi> <mml:mo>,</mml:mo> and 2 <mml:mi>n</mml:mi> ), where are...
Embedding of an antenna within a structural surface is excellent way to improve efficiency and performance. We study the impact characteristics Composite-Antenna-Structure (CAS) degradation in performance after testing. used annular ring patch designed operate two bands: GPS (1.575GHz) DMB (2.62GHz). When 20J energy was applied CAS surface, maximum contact force 4kN, proved resistant impact. The performance, measured by return loss radiation pattern, remained tests.
In-situ measurement of local orientation and strain Has Been carried out for a copperpolycrystals under uniaxial loading using synchrotron x-ray microdiffraction method at the Advanced Light Source. The heterogeneities deformation-induced microstructure within single grains were observed. There differences in selection simultaneously acting slip systems among neighboring volume elements grain.
Summary form only given. A toroidal-micro-cavity of three dimensional (3D) Rayleigh-Fabry-Perot whispering gallery modes formed in the peripheral region active multi-quantum-well planes a VCSEL-like structure, shows ideal quantum-wire properties such as /spl radic/T dependent spectral shifts predicted by photonic-quantum-ring (PQR) formula. The submicron PQR devices are also promising candidate for nano-ampere and few quantum dot lasers. We present emission characteristics lasers against its...