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 1078392
684 2019학년도 2학기 콜로퀴움 일정 2019.07.17 426623
683 <12/3> Magnetic couplings, optical spectra, and spin-orbit exciton in 5d Mott insulator Sr2IrO4 2012.11.26 400078
682 <Mar.3(Wed.)>Scaling laws in Natural Language Processing 2021.02.25 343159
681 2017학년도 1학기 콜로퀴움 일정 2017.01.05 304693
680 <10/25> Wave properties of dipole-exchange spin waves in confined magnetic thin films 2006.10.25 295212
679 <5/16> 물리학자가 바라 본 단백질: 왜, 어떻게 연구하는가? 2012.05.10 268239
678 <6/11> Advanced Physiological Optics and Its Ophthalmic Applications 2014.05.28 257307
677 2020학년도 1학기 콜로퀴움 일정 2020.01.31 254632
676 BK 석학초청 특별세미나 - Frustration and dimensional reduction in multi-orbital systems 2011.10.28 252617
675 <3/14>Adaptive Optics for the Human Eye and Ophthalmic Applications 2008.03.12 247880
674 <6/17> Oscillating Fuzzy Sphere and M5/anti M5 configurations in ABJM model 2009.06.16 245611
673 <12/21> Special Seminar by Professor Ilya Vekhter 2010.11.30 243256
672 <8/30(Wed.)10:30>​Technology convergence and applications of Large-Area Electronics, e-Textiles, bio-sensors and bio-electronics 2017.08.29 243218
671 <11/6> Graphene plasmon and Plasmonics 2013.10.31 240488
670 <June.12(Wed.)> Ribocomputing: Cellular Logic Computation using RNA Devices file 2019.06.07 237874
669 <Jan.14(Thu.)>Oxygen sponge effects for epitaxial manganite thin film design 2021.01.11 234878
668 <11/5(화)> 특별세미나 개최 안내 2013.11.01 229995
667 <5/16(토)> 세미나 개최 안내 2015.05.18 216448
666 <Sep. 23(Wed.) 4:30 PM>Grain boundary effect in Metal : A journey of discovery from crystal to thin films without grain boundaries 2015.09.16 207922