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Prof. Yongkyung Kwon’s Team Identifies Mechanism of Semiconductor-Metal Phase Transition
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2021.11.15
<p><span style="color: #333333; font-family: arial,helvetica,sans-serif; font-size: 10pt;"> <span>Prof. Yongkyung Kwon’s research team from Department of Physics at College of Sciences discovered that semiconductor-metal phase transition occurs in the two-dimensional blue phosphorene bilayer structure. The research paper that theoretically identifies the mechanism was published in ‘The Journal of Physical Chemistry Letters’, the top 10% journal in the field. (Thesis title: </span><span style="background-position: 0% 0%; line-height: 107%; background-image: none; background-attachment: scroll; background-repeat: repeat; background-size: auto; background-origin: padding-box; background-clip: border-box;"><span>Metastable Metallic Phase of a Bilayer Blue Phosphorene induced by Interlayer Bonding and Intralayer Charge Redistributions)<br /><br /> <img alt="" src="ArticleFile.do?id=11834117" /> <img alt="" src="ArticleFile.do?id=11834118" /> <br /> Dr. Junghwan Ahn Prof. Youngkyung Kown<br /><img style="margin-right: auto; margin-left: auto; display: block;" alt="" src="ArticleFile.do?id=11834119" /><br /></span></span></span></p> <p><span style="color: #333333; font-family: arial,helvetica,sans-serif; font-size: 10pt;"><span>Prof. Kwon’s team found out that the features of semiconductor and metal may differ depending on the distance between floors in a specific stacking structure of double-layered blue phosphorene bilayer through Quantum Monte Carlo calculation. His team also confirmed that the state of semiconductor works more energy stable compared to metal. The team also identified a mechanism in which the metallic state is expressed as metastable due to weak chemical bonding between the blue phosphorus layers and the charge redistribution within each layer. The results of this study not only contribute to broadening the understanding of interlayer bonding of two-dimensional materials, but also provide significant guidelines in devising experimental pathways which synthesize blue phosphorus in a metallic state. Moreover, it is expected that it can be applied to the implementation of a single element transistor with a low Schottky barrier.<br /><br /></span><span><span>Dr. Ahn, the first author of the thesis, Prof. Kwon, the corresponding author, Mr, Euihyoon Hong, the student of integrated master’s and doctorate program, Dr. A. Benali from Argonne National Laboratory and Dr. Hyunduk Shin participated in the thesis sharing co-authorship. After earning a doctorate degree at Konkuk University, Dr. Ahn has been working as a postdoctoral researcher at Oak Ridge National Laboratory in the United States since November 2021.</span></span><span><span></span></span><span><span><br /></span></span></span></p>
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