korean english


Home > 게시판 > 세미나

양자물질초전도연구실에서 서울대학교 물리천문학부 김창영 교수님을 초청하여 아래와 같이 세미나를 개최합니다.

학과 구성원 여러분의 많은 참여를 부탁 드립니다.

-오프 혼합으로 진행되는 세미나입니다.


Title: B1g phonon anomaly driven by Fermi surface instability at intermediate temperature in YBa2Cu3O7δ


Speaker:     영 교수님 (서울대학교 물리천문학부)


Date/time: 2021. 7. 14. (Wed.) 11:00AM


○ 온라인 참여방법: 아래의 WebEx 링크 접속



Place: Natural Science 1,  Room No. 31214


Abstract: We performed temperature- and doping-dependent high-resolution Raman spectroscopy experiments on YBa2Cu3O7δ to study B1g phonons. The temperature dependence of the real part of the phonon self-energy shows a distinct kink at T = TB1g above Tc due to softening, in addition to the one due to the onset of the superconductivity. TB1g is clearly different from the pseudogap temperature with a maximum in the underdoped region. The region between TB1g and Tc resembles that of superconducting fluctuation or charge density wave order. While the true origin of the B1g phonon softening is not known, we can attribute it to a gap on the Fermi surface due to an electronic order. Our results may reveal the role of the B1g phonon not only in the superconducting state but also in the intertwined orders in multilayer copper oxide high-Tc superconductors
번호 제목 날짜 조회 수
공지 2022학년도 1학기 콜로퀴움 일정 2022.01.10 27837
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 972967
679 2019학년도 2학기 콜로퀴움 일정 2019.07.17 416444
678 <12/3> Magnetic couplings, optical spectra, and spin-orbit exciton in 5d Mott insulator Sr2IrO4 2012.11.26 271177
677 2020학년도 1학기 콜로퀴움 일정 2020.01.31 248963
676 2017학년도 1학기 콜로퀴움 일정 2017.01.05 232300
675 <8/30(Wed.)10:30>​Technology convergence and applications of Large-Area Electronics, e-Textiles, bio-sensors and bio-electronics 2017.08.29 184557
674 <5/16(토)> 세미나 개최 안내 2015.05.18 169802
673 <6/2> The black hole search at the LHC: critical comment 2011.06.01 146982
672 <May. 25(Wed.) 4:30 PM> Functional Materials @ Nanoscale: Electronics, Energy and ‘Green’Healthcare Applications 2016.05.23 146729
671 <4/2> Radio Detection of Ultra High Energy Cosmic Rays and Neutrinos in Antarctica 2014.03.26 142238
670 2020학년도 2학기 콜로퀴움 일정 2020.07.16 141787
669 <11/7> On-Film Formation of Bi Nanowires with Extraordinary Electron Mobility 2008.11.03 135834
668 <10/25> Wave properties of dipole-exchange spin waves in confined magnetic thin films 2006.10.25 132680
667 <3/13> Probing hidden magnetism and quantum criticality in unconventional superconductors 2009.03.06 131035
666 2016학년도 1학기 콜로퀴움 일정 2016.02.03 130911
665 <5/26>BK21 물리연구단 석학초빙 특별 세미나 2010.05.17 126022
664 2021학년도 1학기 콜로퀴움 일정 2021.01.13 122558
663 <Mar.3(Wed.)>Scaling laws in Natural Language Processing 2021.02.25 121401
662 <11/11>Leptogenesis in triplet seesaw models 2006.11.08 121040
661 2018학년도 2학기 콜로퀴움 일정 2018.07.03 120906