Hanyang University · Engineering
Professor Seung Jae Moon's research lab specializes in the electronic and structural characterization of advanced functional materials, with a focus on transition metal oxides, rare-earth compounds, and nanostructured semiconductors. The lab employs advanced spectroscopic techniques—such as optical spectroscopy, x-ray absorption spectroscopy, and density-functional theory—to investigate electronic correlations, superconductivity, and magnetism in complex oxides. Additionally, the lab explores materials processing techniques, including pulsed laser sintering and recrystallization, to develop high-performance thin films and nanostructured materials for next-generation electronic and energy devices. The integration of experimental and computational methods enables a deep understanding of non-equilibrium phase transformations and functional properties in emerging materials systems.
Figures are computed from collected data and may differ slightly.
We investigated the electronic structures of the two-dimensional layered perovskite ${\mathrm{Sr}}_{2}M{\mathrm{O}}_{4}$ ($M=4d$ Ru, $4d$ Rh, and $5d$ Ir) using optical spectroscopy and polarization-dependent O $1s$ x-ray absorption spectroscopy. While the ground states of the series of compounds are rather different, their optical conductivity spectra $\ensuremath{\sigma}(\ensuremath{\omega})$ exhibit similar interband transitions, indicative of the common electronic structures of the $4d$ and
This letter introduces a dual-type proximity sensor and a control strategy for a robot manipulator to realize safe human-robot interactions (HRI) by using the sensor. Safety is an essential condition for HRI in practical scenarios. To achieve this condition, information about the relationship between an external objects and the robot is required. To obtain this information, we employ a dual-type proximity sensor, which consists of capacitive and inductive transducers and can detect the distance
We investigate the electronic structure of ${\text{EuFe}}_{2}{\text{As}}_{2}$ using optical spectroscopy and density-functional calculations. At low temperature we observe the evolution of two gaplike features, one having a weak-coupling mean-field behavior and another with strongly nonmean-field behavior. Using band-structure calculations, we identify the former with a spin-Peierls-type partial gap in ${d}_{yz}$ bands and the latter with the transition across the large exchange gap in ${d}_{xz}
Recrystallization of thin amorphous silicon (a-Si) films can yield polysilicon (p-Si) material with functional properties suitable for fabrication of electronic devices, including high definition large area active matrix liquid crystal displays. Pulsed laser-effected melting and recrystallization is exceptionally effective since it avoids damage to the underlying insulator structure. The ensuing phase transformations and ultimately the quality of the produced p-Si material strongly depend on the
During the thermal sintering of metal nanoparticles (NPs) the process temperature plays the most important role in the outcome of the sintering results and the selection of a suitable substrate. Here, temperature calculation during pulsed laser sintering of silver (Ag) nanoparticles (NPs) inkjet-printed on glass substrates is presented. During the pulsed laser sintering of Ag NPs, a minimum line resistivity less than twice the bulk silver resistivity was obtained within around 52 s under a laser
Pipe wall thinning by flow-accelerated corrosion and various types of erosion is a significant and costly damage phenomenon in secondary piping systems of nuclear power plants (NPPs). Most NPPs have management programs to ensure pipe integrity due to wall thinning that includes periodic measurements for pipe wall thicknesses using nondestructive evaluation techniques. Numerous measurements using ultrasonic tests (UTs; one of the nondestructive evaluation technologies) have been performed during
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