korean english


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



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 2252
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 813558
293 <Jan. 27(Thu.)>Emulating twisted double bilayer graphene with a multiorbital optical lattice 2022.01.18 21
292 <Nov. 29(Mon.)>Exploring light-matter interactions at atomic scale using electron microscopy 2021.11.22 1540
291 <Nov. 5(Fri.)>Strongly Coupled Moire Photonics 2021.11.01 1863
290 <Aug. 4(Wed.)>Electronic Properties of Mixed-dimensional 2D/3D Heterostructures 2021.08.04 17263
289 <Aug. 6(Fru.)> Gravitationally probing dark matter (DM) microphysics 2021.08.03 4852
» <July 21(Wed.)> Strongly Correlative Ionics 2021.07.19 4608
287 <July 14(Wed.)> B1g phonon anomaly driven by Fermi surface instability at intermediate temperature in YBa2Cu3O7−δ 2021.07.13 6018
286 <July 7(Wed.)>Functional rare earth ionic defects and the related phenomena 2021.07.02 9479
285 <June 30(Wed.)>Mapping of magnetic anisotropy for van der Waals materials 2021.06.25 5330
284 <June 23(Wed.)>Valley Polarization and Exciton Hall Effect in Transition Metal Dichalcogenides 2021.06.22 6970
283 <June 10(Thu.)>Oxide electronics utilizing spin-orbit coupling 2021.05.31 8572
282 <June 01(Tue.)>Frustration-induced Athermal Behaviors: Hilbert Space Fragmentation and Quantum Many-Body Scars 2021.05.24 8911
281 <May 04(Tue.)>Flat bands and the geometry of Bloch wave function 2021.04.27 24613
280 <Feb.18(Thu.)> Hund's metallicity in the vicinity of a Van Hove singularity / Correlated topological phases in strongly correlated heterostructures 2021.02.16 22495
279 <Jan.28(Thu.)>X-ray Absorption Spectroscopy Study of Amorphous Oxide Thin Films 2021.01.27 13267
278 <Jan.14(Thu.)>Oxygen sponge effects for epitaxial manganite thin film design 2021.01.11 30169
277 <11/5(Thu.)> Higher Spin Cooper Pairs 2020.10.27 32955
276 <8/1(Sat.)> Recent Advances in Deep Learning 2020.07.29 18204
275 <2/17(Mon.)> Magneto-optical study of the Dirac semimetal Cd3As2 in Voigt geometry 2020.02.11 39093
274 <12/17(Tue.)> Nuclear spectroscopy with low energy reaction thermal neutrons in ILL 2019.12.17 42967