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날짜 2018-04-11 13:30 
일시 April 11 (Wed), 1:30pm 
장소 #1323 (E6-2, 1st fl.) 
연사 Dr. Yongsoo Yang 

Physics Seminar

 

Probing 3D Structure and Physical Properties of Materials at the Single-Atom Level

 

Dr. Yongsoo Yang

Dept. of Physics and Astronomy, UCLA

 

April 11 (Wed), 1:30pm

#1323 (E6-2, 1st fl.)

 

 

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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386 2016-12-09 16:00  #1323(E6-2. 1st fl.  Shift Charge and Spin Photocurrents in Dirac Surface States of Topological Insulator
385 2022-05-13 14:30  Zoom webinar  Topological Superconducting Spintronics Towards Zero-Power Computing Technologies file
384 2021-07-29 14:00  Online seminar  Gravitationally Induced Dark Sector and Inflationary Dynamics file
383 2015-12-11 13:30  E6-2, #1323  Quantum spin liquid in the 1/3 depleted triangular lattice Ba3(Ru1-xIrx)Ti2O9
382 2016-03-11 13:30  E6-2. 1st fl. #1501  Topological phases of matter in nonequilibrium: Topology of the Wannier-Stark ladder
381 2018-11-01 16:00  #1323, E6-2  Direct holography from a single snapshot file
380 2022-08-18 10:00  E6-1 #1323  Disorder-driven phase transition in the second-order non-Hermitian skin effect
379 2023-04-27 11:00  E6-2 #1322  Inverse Shapiro steps and coherent quantum phase slip in superconducting nanowires
378 2015-07-16 16:00  E6-2, 1318  Next-generation ultrafast laser technology for nonlinear optics and strong-field physics
377 2018-10-26 16:00  #1323, E6-2  Coexisting triple-point and nodal-line topological magnons and thermal Hall effect in pyrochlore iridates file
376 2017-03-24 14:30  #1323 (1st fl. E6-2).  Topological Dynamics
375 2015-10-15 10:00  E6-2, 5th fl. #5318  Development of Large-Bore, High Field Magnets at the NHMFL
374 2023-06-22 16:00  CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus  [CAPP Seminar] The muon g-2 puzzle file
373 2016-05-19 15:00  May 19, 2016 (Thur.) 3PM,  The CERN Resonant WISP Search: Development, Results and Lesson-Learned
372 2016-07-08 11:00  #1323(E6-2. 1st fl.)  Isostatic magnetism
371 2015-11-23 13:30  E6-2, #1323  What's Beyond the Standard Model? Lessons from Run I and what might come in Run II
370 2017-02-01 14:00  #1323(E6-2. 1st fl.)  Quantum electron optics using flying electrons
369 2019-09-10 15:00  E6-2. 1st fl. #1323  Two-Stage Kondo Effect file
368 2017-11-03 14:30  #1323 (1st fl., E6-2.)  Quantum Resistor-Capacitor Circuit with Majorana Edge States file