logo

korean english

게시판

Home > 게시판 > 세미나

양자물질초전도연구실에서 KAIST 물리학과의 양찬호 교수님을 초청하여 아래와 같이 세미나를 개최합니다.

학과 구성원 여러분의 많은 참여를 부탁 드립니다.

-오프 혼합으로 진행되는 세미나입니다.

===========================================================================

Title: Strongly Correlative Ionics

 

Speaker: 양  찬  호  교수님 (KAIST 물리학과)

 

Date/time: 2021. 7. 21. (Wed.) 11:00AM

 

○ 온라인 참여방법: 아래의 WebEx 링크 접속

https://skku-ict.webex.com/meet/koko1977

 

Place: Natural Science 1,  Room No. 31214

 

Abstract: Long-range correlated fluctuations in order parameters occur at phase transition points, revealing emergent functionalities such as the morphotropic-phase-boundary driven high-k dielectrics, large piezoelectricity, and quantum paraelectricity. Likewise, the correlation length of thermal and quantum fluctuations of atomic positions can be divergently large at the critical point, leading to rapid and coherent ionic conduction. However, the lack of a lattice system that exhibits competing defect orderings has hindered study of the feasibility of this general thermodynamic wisdom. Here, we demonstrate that the activation energy associated with oxygen transport is sharply lowered in Ca-substituted bismuth ferrite (Bi1-xCaxFeO3-) thin films. Our demonstration relies on the finding that a compositional phase boundary between two isostructural phases with oxygen vacancy channel orderings competitively along the <100> or <110> crystal axes emerges at a chemical doping ratio. From first-principle calculations, we clarify that the effective short-range attraction between two positively charged oxygen vacancies sharing lattice deformation is the driving force of the long-range order and collective diffusion in the system. Our findings open a new avenue into strongly correlative ionics.
번호 제목 날짜 조회 수
공지 2022학년도 1학기 콜로퀴움 일정 2022.01.10 2279
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 813591
667 <Jan. 27(Thu.)>Emulating twisted double bilayer graphene with a multiorbital optical lattice 2022.01.18 22
666 <Dec. 1(Wed.)>Halide Perovskite Single Crystals and Thin Films for Solar Cells and Optoelectronics 2021.11.25 1913
665 <Nov. 29(Mon.)>Exploring light-matter interactions at atomic scale using electron microscopy 2021.11.22 1543
664 <Nov. 17(Wed.)>펜로즈의 삼각형과 블랙홀 - 부분과 전체 2021.11.11 1498
663 <Nov. 10(Wed.)>Optical Spectroscopy of 2-Dimensional Materials 2021.11.03 1603
662 <Nov. 5(Fri.)>Strongly Coupled Moire Photonics 2021.11.01 1870
661 <Nov. 3(Wed.)>시공간의 구조: 상대성이론, 특이점, 우주상수 2021.10.28 2101
660 <Oct. 27(Wed.)> How interactions shape ecological communities 2021.10.20 2181
659 <Oct. 13(Wed.)> Electric Quantum Oscillation: A New Form of Quantum Oscillation 2021.10.06 5532
658 <Oct. 6(Wed.)> 블랙홀에서 쌍꺼풀수술까지 2021.09.29 2253
657 <Sep. 29(Wed.)> Longitudinal Spin Seebeck effect in Pt/YIG structure with monolayer WSe2 and MoS2 interlayer 2021.09.16 3274
656 <Sep. 15(Wed.)> 강화학습 - 시행착오를 통해 배워나가는 인공지능 2021.09.08 2378
655 <Sep. 8(Wed.)> Utilizing physics to build a trapped-ion quantum computer 2021.09.01 3087
654 <Aug. 4(Wed.)>Electronic Properties of Mixed-dimensional 2D/3D Heterostructures 2021.08.04 17269
653 <Aug. 6(Fru.)> Gravitationally probing dark matter (DM) microphysics 2021.08.03 4864
» <July 21(Wed.)> Strongly Correlative Ionics 2021.07.19 4612
651 <July 14(Wed.)> B1g phonon anomaly driven by Fermi surface instability at intermediate temperature in YBa2Cu3O7−δ 2021.07.13 6021
650 <July 7(Wed.)>Functional rare earth ionic defects and the related phenomena 2021.07.02 9481
649 2021학년도 2학기 콜로퀴움 일정 2021.07.01 84956