visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2020-10-16 16:00 
연사  
장소 https://kaist.zoom.us/j/89198078609 

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.

 

번호 날짜 연사 제목
공지 2025-02-24 16:00    2025년 봄학기 콜로키움 안내
공지 2025-02-27 16:00    2025년 봄 물리학과 특별세미나 (광학/응집물리 분야)
606 2019-09-18 16:00    Fall 2019: Physics Seminar Serises file
605 2019-09-02 16:00    Fall 2019: Physics Colloquium file
604 2024-01-26 15:00    In-situ 4D-STEM studies on surface reconstruction and polarization switching of perovskite oxides
603 2020-09-24 09:00    (CAPP/IBS)Searching for Dark Matter with a Superconducting Qubit , Cryogenic Microwave Circuit Development at the NSTU file
602 2021-01-28 18:00    Quantum metamaterials: concept, theory, prototypes and possible applications file
601 2023-09-18 11:00    Magic polarisation trapping of polar molecules for tunable dipolar interactions file
600 2015-12-09 14:00    SWELLABLE COLLOIDAL PARTICLES ARE SWELL
599 2015-12-09 11:00    Functional Imaging & Monitoring of Brain & Breast with Diffuse Light
598 2020-09-28 17:30    KAIST Global Forum for Spin and Beyond(Fourth Forum) file
597 2024-03-28 11:00    Geometric characterization of thermoelectric performance of two-dimensional quadratic band-crossing semimetals
596 2023-01-12 16:00    Spin wavepackets in the Kagome ferromagnet Fe3Sn2: propagation and precursors
595 2021-04-19 19:00    Evidence of Electrical Switching in Antiferromagnets and Coherent Spin Pumping file
594 2017-12-14 15:00    Exploring the Universe via GWs in the era of multi-messenger astronomy
593 2019-10-25 15:00    Physics Seminar file
592 2024-11-21 11:00  Daniel L. Jafferis  3d Gravity and Tensor Model file
591 2023-10-04 16:00    [High-Energy Theory Seminar] Moving towards quantum technologies: the case of quantum batteries
590 2024-06-05 10:00    Moir\’e fractals in supermoir\’e structures
589 2016-12-12 13:30    “Possible symmetry in the phase diagrams of electron- & hole-doped cuprate high-Tc superconductors”
588 2025-06-05 10:00  Dr . On Kim (University of Mississippi)  The Final Result from the Muon g-2 Experiment at Fermilab: The World’s Most Precise Measurement of the Muon Magnetic Anomaly file
587 2016-04-06 15:30    Superconducting Quantum Interference Devices for Precision Detection