장소 | #1323 (E6-2, 1st fl.) |
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일시 | April 11 (Wed), 1:30pm |
연사 | Dr. Yongsoo Yang |
Physics Seminar
“Probing 3D Structure and Physical Properties of Materials at the Single-Atom Level”
Dept. of Physics and Astronomy, UCLA
Abstract:
Modern science and technology rely on functional materials, and the physical properties of these materials often strongly depend on defects, local disorder, nanoscale heterogeneities, and grain structures at the atomic scale. Traditional crystallography, which is reliant on periodicity, has been the main method for determining crystal structures, but cannot determine defects or other non-crystalline features. My work goes beyond crystallography. Without any prior assumption of underlying structure, atomic electron tomography (AET) is now able to locate the 3D coordinates of individual atoms with picometer precision and with elemental specificity [1-3]. I will show a variety of complex atomic structures with 3D atomic-level details; including grain boundaries, chemical order/disorder, phase boundaries, and anti-site point defects. I will further demonstrate that these experimentally determined atomic structures can be combined with quantum mechanical calculations to provide an atomic-level understanding of physical properties such as 3D strain tensors, magnetic moments and local magnetocrystalline anisotropy. Understanding the relationship between atomic structure and physical properties will open up new avenues in condensed matter physics and allow the rational design of novel materials at the atomic scale [1-2].
[1] Yang et al., Nature 542, 75-79 (2017).
[2] Xu et al., Nature Mater. 14, 1099-1103 (2015).
[3] Pryor*, Yang* et al., Sci. Rep. 7:10409 (2017).
Contact: Yongseop Kang, Administration Team (T.2599)
Department of Physics
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공지 | 2019/09/02 - 12/09 | Seminar Room 1501 | 이호성 박사 (한국표준과학연구원) and etc. | Fall 2019: Physics Colloquium |
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Physics Colloquium : 2010 Fall
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178 | 2010/02/14-05/09 | E6, 1501 | 황철주(주성엔지니어링 사장) 외 |
Physics Colloquium - 2011 Spring
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177 | 2011/05/16, 4PM | E6, 1501 | 서민교교수(KAIST) | Photonics with surface plasmon polaritons |
176 | 2011/09/03-12/06 | E6, 1501 | 김용균교수(한양대) 외 |
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174 | 2012/04/02, 4PM | E6, 1501 | Yong Hee Jeong | A new route to ferroelectricity in magnetic spinels: a case of Co2MnO4 |
173 | 2013/03/11-06/10 | E6, 1501 | 강명수교수(KAIST) 외 | Physics Colloquium : 2013 Spring |
172 | 2013/09/09-12/09 | E6, 1501 | 박혁규교수(부산대) 외 | Physics Colloquium : 2013 Fall |
171 | 2014/03/10-06/09 | E6, 1501 | 신용일교수(서울대) |
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170 | 2015/09/15-12/08 | E6, 1501 | 박제근 교수(서울대 물리학과) 외12명 |
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169 | 2015/03/09-06/08 | E6, 1501 | 최현용교수(연세대) 외12명 |
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168 | 2015/09/07-12/01 | E6, 1501 | 문은국 교수(KAIST) 외 |
Physics Colloquium : 2015 Fall
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167 | 2016/03/07-06/13 | E6, 1501 | Prof. David Helfman(KAIST) 외 |
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