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 1079042
16 <12/3> Magnetic couplings, optical spectra, and spin-orbit exciton in 5d Mott insulator Sr2IrO4 2012.11.26 403438
15 <11/21> Cosmological viable scalar-tensor theories of gravity 2012.11.16 105163
14 <11/5> Optical spectroscopic probe on the surface state in three dimensional topological insulators 2012.10.24 77362
13 <10/24> Dung-hai Lee 교수와의 간담회 2012.10.23 71271
12 <11/22> Spin polarization of photoelectrons from a topological insulator 2012.10.22 70858
11 <10/23> Measuring Transfer Reactions with Radioactive Beams 2012.10.15 86748
10 <10/12> Kondo Effect in a Quantum-Dot-Topological-Superconductor Junction: A Numerical Renormalization Group Analysis 2012.10.08 93262
9 <10/5> Gauge fields. Past, present, future. 2012.10.05 71240
8 <10/8 (월)>물리학과 특별세미나 개최 안내 2012.10.05 97669
7 <9/20> Time-reversal anomaly in Josephson effect involving Majorana fermions 2012.09.20 205277
6 <9/14> High temperature superconductivity and fluctuating stripe 2012.09.10 70597
5 <9/7> On Dark Matter and its indirect detection with box-shaped gamma-rays 2012.09.05 71510
4 <9/7(금)> Kondo Effect in Chiral Orbital Bands 2012.08.31 76462
3 <8/7> Scotch tape and spectroscopy: probing and manipulating the surface of a topological insulator 2012.07.27 90254
2 <7월27일>Correlated topological phases in 3D complex oxides via Green's functions 2012.07.27 95642
1 <6/21> Nuclear Astrophysics in Effective Field Theories 2012.06.20 84699