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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번호 | 일시 | 장소 | 연사 | 제목 |
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공지 | 2019/09/18 - 12/5 | Seminar Room #1323 | Prof. David Schuster and etc. | Fall 2019: Physics Seminar Serises |
공지 | 2019/09/02 - 12/09 | Seminar Room 1501 | 이호성 박사 (한국표준과학연구원) and etc. | Fall 2019: Physics Colloquium |
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33 | Nov. 20 (Fri.), 04:00 PM | Online | Dr. Dohun Kim | Coherent control of field gradient induced quantum dot spin qubits |
32 | September 5 (Wed.), 16:00 PM | #1323, E6-2 | Dr. Dirk Wulferding |
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31 | June 22 (Fri.), 04:00 PM | #1323, E6-2 | Dr. Daniel Sando |
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30 | June 22 (Fri.), 04:00 PM | #1323, E6-2 | Dr. Daniel Sando |
Tuning functional properties of BiFeO3 films using strain and growth chemistry
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29 | Oct. 12 (Fri.), 02:30 PM | E6-2. 1st fl. #1323 | Dr. Daniel Kyungdeock Park |
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28 | May 16, 2016 (Mon) 4PM | #1323(E6-2, 1st Fl.) | Dr. Daniel Bowring , Fermi National Accelerator Laboratory | Tuning microwave cavities with biased nonlinear dielectrics for axion searches |
27 | 2015/11/19, 4PM | E6-2, #1323 | Dr. Daesu Lee (University of Wisconsin-Madison) | Emergent Collective Phenomena and Functions at Reduced Dimensions |
26 | Oct. 16 (Fri.), 04:00 PM | https://kaist.zoom.us/j/89198078609 | Dr. Daesu Lee |
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25 | 2015/12/02, 4PM | E6-2, #1323 | Dr. Dae-Jeong Kim (Dept. of Physics and Astronomy, University of California, Irvine) | Samarium Hexaboride: Is it a Topological insulator? |
24 | Oct. 16 (Fri.), 02:30 PM | https://kaist.zoom.us/j/89198078609 | Dr. Chulki Kim |
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23 | Oct. 07 (Fri), 4:00 PM | E6-2. #1323(1st fl.) | Dr. Choong Hyun Kim,IBS-CCES, Seoul National University | “Tilt engineering of 4d and 5d transition metal oxides?” |
22 | Apr. 08 (Fri.), 4:00 PM | E6-2. 5st fl. #1501 | Dr. Changyoung Kim, SEOUL NATIONAL UNIV. | Spectroscopic studies of iron-based superconductors : what have we learned? |
21 | Sep. 4 (Tue), 02:30 PM | E6-2. 2st fl. #2502 | Dr. Changmin Lee, MIT |
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20 | December 13 (Fri.), 1:00 PM | #2501, E6-2 | Dr. Chang-Jong Kang |
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19 | Apr. 28 (Thu.) 3PM | #2501(E6-2. 2nd fl.) | Dr. Chang Hee Sohn, SEOUL NATIONAL UNIVERSITY | Lattice/Spin/Charge Coupling in 5d Pyrochlore Cd2Os2O7 |
18 | Oct. 18 (Tue.), 1:30 PM | 1st fl. #1323(E6-2) | Dr. Chan-Ho Yang, Department of Physics, KAIST | "Visualization of oxygen vacancy in motion and the interplay with electronic conduction" |
17 | JAN. 7 (Mon), 03:00 PM | E6-2. 2st fl. #2501 | Dr. Byoung min Kang |
Many-Body Invariants for Multipoles in Higher-Order Topological Insulators
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