|장소||#1323 (E6-2, 1st fl.)|
|일시||April 11 (Wed), 1:30pm|
|연사||Dr. Yongsoo Yang|
Dept. of Physics and Astronomy, UCLA
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].
 Yang et al., Nature 542, 75-79 (2017).
 Xu et al., Nature Mater. 14, 1099-1103 (2015).
 Pryor*, Yang* et al., Sci. Rep. 7:10409 (2017).
Contact: Yongseop Kang, Administration Team (T.2599)
Department of Physics
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|260||November 29 (Thu.), 16:00 PM||#1323, E6-2||Dr. Kee suk Hong||양자 칸델라 실현을 위한 단일 광자 발생장치 개발|
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|258||November 8 (Thu.), 16:00 PM||#1323, E6-2||이종완 박사||Conformality lost|
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|256||October 26 (Fri.), 4:00 PM||#1323, E6-2||Dr. Kyusung Hwang||Coexisting triple-point and nodal-line topological magnons and thermal Hall effect in pyrochlore iridates|
|255||October 25 (Thu.), 4:00 PM||#1323, E6-2||Dr. Gang Li||Abelian and non-Abelian dark photons|
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|253||October 19 (Fri.), 10:00 AM||#1323, E6-2||Dr. Jongsoo Yoo||Energy conversion processes during magnetic reconnection in a laboratory plasma|
|252||October 18 (Thu.), 10:00 AM||#1323, E6-2||Dr. Duyoung Min||Understanding membrane protein folding using single-molecule force techniques|
|251||October 16 (Tue.), 10:00 AM||#1323, E6-2||Dr. Won-Ki Cho||Capturing protein cluster dynamics and gene expression output in live cells|
|250||October 15 (Mon.), 16:00 PM||#1323, E6-2||Dr. Yongjoo Baek||Universal properties of macroscopic current-carrying systems|
|249||October 11 (Thu.), 16:00 PM||#1323, E6-2||Prof. Joung-Real Ahn||Dirac electrons in a graphene quasicrystal|
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|246||September 5 (Wed.), 16:00 PM||#1323, E6-2||Dr. Dirk Wulferding||Shining a light on fractional excitations|
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