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 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 1090156
658 <Oct. 6(Wed.)> 블랙홀에서 쌍꺼풀수술까지 2021.09.29 6448
657 <Sep. 29(Wed.)> Longitudinal Spin Seebeck effect in Pt/YIG structure with monolayer WSe2 and MoS2 interlayer 2021.09.16 125892
656 <Sep. 15(Wed.)> 강화학습 - 시행착오를 통해 배워나가는 인공지능 2021.09.08 5987
655 <Sep. 8(Wed.)> Utilizing physics to build a trapped-ion quantum computer 2021.09.01 27361
654 <Aug. 4(Wed.)>Electronic Properties of Mixed-dimensional 2D/3D Heterostructures 2021.08.04 87270
653 <Aug. 6(Fru.)> Gravitationally probing dark matter (DM) microphysics 2021.08.03 37808
» <July 21(Wed.)> Strongly Correlative Ionics 2021.07.19 34769
651 <July 14(Wed.)> B1g phonon anomaly driven by Fermi surface instability at intermediate temperature in YBa2Cu3O7−δ 2021.07.13 47380
650 <July 7(Wed.)>Functional rare earth ionic defects and the related phenomena 2021.07.02 121698
649 2021학년도 2학기 콜로퀴움 일정 2021.07.01 141213
648 <June 30(Wed.)>Mapping of magnetic anisotropy for van der Waals materials 2021.06.25 92883
647 <June 23(Wed.)>Valley Polarization and Exciton Hall Effect in Transition Metal Dichalcogenides 2021.06.22 34339
646 <June 10(Thu.)>Oxide electronics utilizing spin-orbit coupling 2021.05.31 167773
645 <June 01(Tue.)>Frustration-induced Athermal Behaviors: Hilbert Space Fragmentation and Quantum Many-Body Scars 2021.05.24 47001
644 <May 12(Wed.)> Nanomechanical oscillators for quantum technology 2021.05.06 24875
643 <May 04(Tue.)>Flat bands and the geometry of Bloch wave function 2021.04.27 80851
642 <April 28(Wed.)> 손에 잡히는 AI 2021.04.21 11183
641 <April 21(Wed.)> 우주배경복사 편광 관측 - 남극점 기지 바이셉/켁 어레이(BICEP/Keck Array) 망원경 2021.04.12 10601
640 <April 7(Wed.)> Mid-scale facilities for condensed matter research: high magnetic field and neutron scattering 2021.03.31 154948
639 <Mar.31(Wed.)> Nonlinear nanophotonics using on-chip microring resonator 2021.03.25 46727