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 |
---|---|---|---|---|
342 | Nov. 20 (Fri.), 02:30 PM | Online | Dr. Doohee Cho | Lumpy Cooper pairs in an iron-based superconductor |
341 | #1323(E6-2. 1st fl.) | Jul. 10th (Mon), 4pm | Dr. Duk Young Kim Los Alamos National Laboratory |
“Intertwined Orders in a Heavy-fermion metal”
![]() |
340 | May. 25th (Wed), 14:00 | E6 Room(#2501) | Dr. Duk-Hyun Choe(Samsung Advanced Institute of Technology) |
Atomic-level insights into ferroelectric switching and preferred orientation of ultrathin hafnia
![]() |
339 | October 18 (Thu.), 10:00 AM | #1323, E6-2 | Dr. Duyoung Min |
Understanding membrane protein folding using single-molecule force techniques
![]() |
338 | July 2, 2020 (Thursday) | Zoom Video Conference Seminar | Dr. Emmanuel Flurin (CEA Saclay) |
An irreversible qubit-photon coupling for the detection of itinerant microwave photons
![]() |
337 | 2015/08/04, 11PM | B501, Room Red, KI bldg. 5nd fl. | Dr. Eric Jin Ser Lee(Univ. of Manitoba, Canada) | Propagation of ultrasound through two- and three-dimensional strongly scattering media |
336 | Jul. 07 (Thu.) 2PM | #1323(E6-2. 1st fl.) | Dr. Eun Ah Kim, CORNELL UNIV. | Let there be topological superconductors |
335 | Sep. 22 (Fri.), 01:00 PM | E6-2. 1st fl. #1323 | Dr. EunSeong Kim / Department of Physics, KAIST |
Superconductor-metal-insulator transition in thin Tantalum films
![]() |
334 | Jun. 2 (Fri.), 02:30 PM | E6-2. 1st fl. #1323 | Dr. Euyheon Hwang(황의헌) |
Quasiparticle Interference and Fourier transform scanning tunneling spectroscopy in WTe2 (Weyl semimetal)
![]() |
333 | May 24 (Tue) 4 PM | E6-2. #1323(1st fl.) | Dr. Euyheon Hwang, SKKU Advanced Institute of Nanotechnology, Sung Kyung Kwan University | Electronic and magnetic properties of 2D transition-metal thiophosphates and tunability of magnetic order with carrier density |
332 | April 4, 2016 (Mon) - April 8, 2016 (Fri) | KAIST Natural Science Building (E6-2), RM #4314 | Dr. Fritz Caspers (CERN) | Radio frequency engineering |
331 | Nov. 1st (Tue), 10:30AM | #1323(E6-2 1st fl.) | Dr. Gadi Eisenstein, Technion | Time scale dependent dynamics in InAs/InP quantum dot gain media |
330 | October 25 (Thu.), 4:00 PM | #1323, E6-2 | Dr. Gang Li |
Abelian and non-Abelian dark photons
![]() |
329 | Sep. 22 (Fri.), 04:00 PM | E6-2. 1st fl. #1323 | Dr. GilHo Lee / Department of Physics, POSTECH |
Unexpected Electron-Pairing in Integer Quantum Hall Effect
![]() |
328 | Sep. 22 (Fri.), 02:30 PM | E6-2. 1st fl. #1323 | Dr. GilHo Lee / Department of Physics, POSTECH |
Quantum Electronic Transport in Graphene Hybrid Nanostructures
![]() |
327 | Dec. 7 (Fri.), 02:30 PM | E6-2. 1st fl. #1323 | Dr. Gyung Min Choi |
Spin generation from heat and light in metals
![]() |
326 | 2015/09/14, 2PM | E6-2. 2nd fl. #2501 | Dr. Hae Ja Lee ( Stanford University, SLAC ) | Ultrafast X-ray Studies on Dynamics Matter in Extreme Conditions |
325 | Sep. 22, 2016(Thu), 3:30 PM | #1323(E6-2, 1st fl.) | Dr. Haiyang Yan (Institute of Nuclear Physics and Chemistry) | Polarized 3He, Polarized Neutrons and New Interactions beyond the Standard Model |
324 | Sep. 22, 2016(Thu), 3:30 PM | #1323(E6-2, 1st fl.) | Dr. Haiyang Yan (Institute of Nuclear Physics and Chemistry) | Polarized 3He, Polarized Neutrons and New Interactions beyond the Standard Model |
323 | May 19 (Thu) 4PM | #1323(E6-2, 1st fl.) | Dr. Heedeuk Shin, POSTECH | Nonlinear/quantum optical effect in silicon nano-photonics |