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 |
---|---|---|---|---|
88 | Mar. 2nd (Thu), 4:00 p.m | #1323(E6-2. 1st fl.) | Dr. Jonathan Denlinger, Lawrence Berkeley National Lab | “Progress in the comparison of ARPES to DMFT for d and f strongly correlated electron systems” |
87 | Dec. 8(Thu) 4p.m. | #1323(E6-2. 1st fl.) | Dr. Jinhyoung Lee, Hanyang University | Dynamical Resonance between Two Optical Cavities via Optomechanical Oscillator |
86 | Mar. 16 (Fri.), 02:30 PM | E6-2. 1st fl. #1323 | Dr. JinHee Kim |
산화물 다층박막에서의 다양한 물리현상
![]() |
85 | Sep. 27 (Fri.), 04:00 PM | E6-2. 1st fl. #1323 | Dr. Jindong Song |
0D/1D/2D/3D III-V materials grown by MBE for Optelectronics
![]() |
84 | Jun. 11 (Fri.), 02:30 PM | Online seminar | Dr. Jin Woong Cha(KRISS) |
Engineering sound waves and vibrations in multi-mode nanomechanical systems
![]() |
83 | Apr.19 (Fri.), 11:00 AM | #1323, E6-2 | Dr. Ji-Sang Park |
First-principles studies of semiconductors for solar cell applications
![]() |
82 | 2015/12/11, 3:45PM | E6-2, #1323 | Dr. Ji Hun Sim (POSTECH) | Dynamical mean field theory studies on heavy fermion system |
81 | Apr. 28 (Fri.), 02:30 PM | E6-2. 1st fl. #1323 | Dr. JeongYoung Park Graduate School of EEWS, KAIST | Hot electron generation at surfaces and its impact to catalysis and renewable energy conversion |
80 | Apr. 12 (Tue.), 4 PM | E6-2. 1st fl. #1323 | Dr. Jeehoon Kim, POSTECH | Confinement of Superconducting Vortices in Magnetic Force Microscopy |
79 | May. 14 (Fri.), 04:00 PM | Online seminar | Dr. Je-Hyung Kim(UNIST) |
Spatial and temporal separation of environmental dephasing sources from solid-state quantum emitters
![]() |
78 | 2015/09/07, 3PM | E6-2. 1st fl. #1318 | Dr. Jasbinder Sanghera (U.S. Naval Research Laboratory (NRL)) | Advanced Optical Materials and Devices at NRL |
77 | Nov. 24(Thu) 4p.m. | #1323(E6-2. 1st fl.) | Dr. Jai-Min Choi, Chonbuk National Univiersity | Harmonic oscillator physics with single atoms in a state-selective optical potential |
76 | October 16 (Wed), 4:00pm | #1323 (E6-2, 1st fl.) | Dr. Jaewon Song |
Emergent black holes and monopoles from quantum fields
![]() |
75 | Dec. 9(Fri), 1:30 p.m. | #1323(E6-2. 1st fl.) | Dr. Jae Yoon Cho, POSTECH | Entanglement area law in strongly-correlated systems |
74 | Thursday, July 12, 2018 at 17:00 | Room 5318, KAIST Natural Sciences Lecture Hall(E6) | Dr. Jae Hyeok Yoo (University of California, Santa Barbara, Department of Physics) | The MilliQan Experiment: Search for Milli-Charged Particles at the LHC |
73 | July 31(Wed.)/ 16:00 | E6-2, #1323 | Dr. Ivan Borzenets |
Features of ballistic superconducting graphene
![]() |
72 | Dec. 26 (Wed.), 04:00 PM | E6-2. 1st fl. #1323 | Dr. Isaac H. Kim |
Brane-like defect in 3D toric code
![]() |
71 | Oct. 12 (Fri.), 04:00 PM | E6-2. 1st fl. #1323 | Dr. HyungWoo Lee |
Direct observation of a two-dimensional hole gas at oxide interfaces
![]() |
70 | Jan. 26th (Tue), 13:00 | E6 #1501 | Dr. Hyojin Jung (NIMS) |
An Introduction to Cohomology groups
![]() |
69 | July 27, 2018 at 15:00 | Room 5318, KAIST Natural Sciences Lecture Hall(E6). | Dr. Hyejung Kim(Technische University Dresden) |
Muon g-2 in the 2HDM and MSSM: comprehensive numerical analysis and absolute maxima
![]() |