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Choi, Kyunghee,Lee, Kimoon,Yu, Sanghyuck,Oh, Sehoon,Choi, Hyoung Joon,Bae, Heesun,Im, Seongil American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.24
<P>Transition-metal dichalcogenides are currently under rigorous investigation because of their distinct layer-dependent physical properties originating from the corresponding evolution of the band structure. Here, we report the highly resolved probing of layer-dependent band structure evolution for WSe<SUB>2</SUB> using photoexcited charge collection spectroscopy (PECCS). Monolayer, few-layer, and multilayer WSe<SUB>2</SUB> can be probed in top-gate field-effect transistor platforms, and their interband transitions are efficiently observed. Our theoretical calculations show a great coincidence with the PECCS results, proving that the indirect Γ-K and Γ-Λ transitions as well as the direct K-K transition are clearly resolved in multilayer WSe<SUB>2</SUB> by PECCS.</P> [FIG OMISSION]</BR>
Choi, Seongil,Sim, Hasung,Kang, Soonmin,Choi, Ki-Young,Park, Je-Geun Institute of Physics 2017 Journal of Physics, Condensed Matter Vol.29 No.9
<P>Hexagonal RMnO<SUB>3</SUB> is a multiferroic compound with a giant spin–lattice coupling at an antiferromagnetic transition temperature, Lee <I>et al</I> (2008 <I>Nature</I> <B>451</B> 805). Despite extensive studies over the past two decades, the origin and underlying microscopic mechanism of strong spin–lattice coupling remain very much elusive. In this study, we have tried to address this problem by measuring the thermal expansion and dielectric constant of doped single crystals Y<SUB>1−<I>x</I> </SUB>Lu<SUB> <I>x</I> </SUB>MnO<SUB>3</SUB> where <I>x</I> = 0, 0.25, 0.5, 0.75, and 1.0. From these measurements, we confirm that there is a progressive change in the physical properties with doping. At the same time, all our samples exhibit clear anomalies at <I>T</I> <SUB>N</SUB>, even in the samples where <I>x</I> = 0.5 and 0.75. This is opposed to some earlier ideas, which suggests an unusual doping dependence of the anomaly. Our work reveals yet another interesting facet of the spin–lattice coupling issue in hexagonal RMnO<SUB>3</SUB>.</P>
최성일(Seongil Choi),조성권(Sungkwon Jo),김관태(Kwan-Tae Kim),이대훈(Dae Hoon Lee),송영훈(Young-Hoon Song) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
The use of LFG is suggested as one of Greenhouse gas reduction plan and renewable energy research. In this study, we have studied ATR reaction system using plasma and catalytic reaction as a way to utilize LFG. This ATR reaction is a method of using the exothermic energy of the partial oxidation reaction for the dry reforming reaction. The experiment was performed according to O₂/C ratio. As a result of the experiment, it was confirmed that the ATR reaction was performed, and the production cost of the syngas was 6.0 kJ/L at an O₂/C ratio of 0.3. The proper ratio of external heat source to internal exothermic reaction should be considered important.