Hidden room-temperature ferroelectricity in CaTiO3 revealed by a metastable octahedral rotation pattern
2020.10.13 11:45
장소 | https://kaist.zoom.us/j/89198078609 |
---|---|
일시 | Oct. 16 (Fri.), 04:00 PM |
연사 | Dr. Daesu Lee |
“Hidden room-temperature ferroelectricity in CaTiO3 revealed by a metastable octahedral rotation pattern”
Dr. Daesu Lee
Department of Physics, POSTECH
Oct. 16 (Fri.), 04:00 PM Online seminar
https://kaist.zoom.us/j/89198078609
회의 ID: 891 9807 8609
암호: 660431
Abstract:
Nonequilibrium atomic structures can host exotic and technologically relevant properties in otherwise conventional materials. Oxygen octahedral rotation forms a fundamental atomic distortion in perovskite oxides, but only a few patterns are predominantly present at equilibrium. This has restricted the range of possible properties and functions of perovskite oxides, necessitating the utilization of nonequilibrium patterns of octahedral rotation. Here, we report that a designed metastable pattern of octahedral rotation leads to robust room-temperature ferroelectricity in CaTiO3, which is otherwise nonpolar down to 0 K. Guided by density-functional theory, we selectively stabilize the metastable pattern, distinct from the equilibrium pattern and cooperative with ferroelectricity, in heteroepitaxial films of CaTiO3. Atomic-scale imaging combined with deep neural network analysis confirms a close correlation between the metastable pattern and ferroelectricity. This work reveals a hidden but functional pattern of oxygen octahedral rotation and opens avenues for designing multifunctional materials.
댓글 0
번호 | 일시 | 장소 | 연사 | 제목 |
---|---|---|---|---|
318 | 2016/09/05-12/12 4PM | Natual Scien Bldg.(E6)m #1501 | Yeong Kwan Kim 외 |
Physics Colloquium : 2016 Fall
![]() |
317 | 2016/09/29-12/13 | E6-2, #1323 | Sangyoon Han 외 |
2016 Fall, Physics Seminar Serises
![]() |
316 | 2016/1/11, 4PM | E6-2, #1323 | Dr. B.J.Kim (Max Planck Institute for Solid State Research) | Mott Physics in the Strong Spin-Orbit Coupling Regime |
315 | 2016/1/26, 2PM | E6-2, #1323 | Dr. Sergei V. Kalinin (Center for Nanophase Materials Sciences, Oak Ridge National Laboratory) | Electrochemistry on Nano- and Atomic Levels: Scanning Probe Microscopy Meets Deep Data |
314 | 2017.1.9(Mon), 4PM | Lecture Hall, College of Natural Sciences [#1501,E6-2] | Prof. John Michael Kosterlitz, Brown University |
Topological Defects and Phase Transitions"
![]() |
313 | 2017/03/06 - 05/29 | Seminar Room 1501 | 이종봉 박사 (POSTECH) 외 |
Spring 2017: Physics Colloquium
![]() |
312 | 2017/03/21 - 06/08 | Seminar Room 1323 | 조길영 박사(KAIST) 외 |
Spring 2017: Physics Seminar Serises
![]() |
311 | 2018. 6. 22 10:00am ~ 11:50am | E6-6, Lecture Room 119 (1F) | Prof. Sang Bok Lee, Dept. of Chemistry and Biochemistry, Univ. of Maryland |
Success in Research Career
![]() |
310 | 2018년 9월 7일 (금), 3PM | 학술문화관 (E9), 2층 양승택 오디토리움 | Prof. Martin Head-Gordon, UC Berkeley |
Recent developments in density functional theory: From new functionals to the nature of the chemical bond
![]() |
309 | 2019. 7. 16(화) | Rm. 1323 (E6-2) | Prof. Sidney Nagel |
2019 Physics Distinguished Lecture
![]() |
308 | 2019. 8. 22 4PM & 8. 23 3PM | #1323, E6-2 | Prof. Andrew N Cleland |
Physics and Applications in Nanoelectronics and Nonomechanics
![]() |
307 | 2019/09/02 - 12/09 | Seminar Room 1501 | 이호성 박사 (한국표준과학연구원) and etc. |
Fall 2019: Physics Colloquium
![]() |
306 | 2019/09/18 - 12/5 | Seminar Room #1323 | Prof. David Schuster and etc. |
Fall 2019: Physics Seminar Serises
![]() |
305 | 3 PM, 12 Jun (Wed), 2019 | Rm# 1323, E6-2 | Dr. Minyoung You |
The relation between free and interacting fermionic SPT phases
![]() |
304 | 3. 14(월),16:00 | E6, #1501 | 박용근교수 (KAIST 물리학과) | Quantitative phase imaging and artificial intelligence: label-free 3D imaging, classification, and inference |
303 | 3. 21(월),16:00 | E6, #1501 | 이상성교수 (한국천문연구원) | Multi-wavelength Studies on Relativistic Jets from Gamma-ray Bright Active Galactic Nuclei |
302 | 3. 28(월), 16:00 | E6, #1501 | 이준희교수 (UNIST 에너지 및 화학공학부) | Ultimate-density atomic semiconductor via flat bands |
301 | 3. 7(월),16:00` | E6, #1501 | 손석우교수 (서울대 지구환경과학부) | Climate Physics and Modelling(우리말강의) |
300 | 3pm, 19th May | online | Jonghee Yoon, PhD (Assistant professor, Department of Physics, Ajou University) | (광학분야 특별세미나) |
299 | 3pm, 19th May | online | Jonghee Yoon, PhD (Assistant professor, Department of Physics, Ajou University) | (광학분야 특별세미나)Development of a multimodal optical system for improved disease diagnosis |