logo

korean english

게시판

Home > 게시판 > 세미나

아래와 같이 콜로퀴움을 개최하오니 많이 참석해 주시기 바랍니다.


4시 20분부터 제1과학관 31214 e+강의실에서 간단한 다과를 제공합니다.


아 래


Title: Ultrafast Movie Maker for Photo-induced Dynamics: Ultrafast Electron Microscope


Speaker: 장   기   석  박사님 (LG Display)


Date & Time: Mar. 27. (Wed.) 2019 4:30 PM


Place: Natural Science 1,  Room No. 31214


Abstract: Making a ‘molecular movie’ is Holy Grail to directly visualize structural phase transitions among metal, insulator and superconductor and photo-induced non-thermal energy transfer processes. To achieve this, an ‘ultrafast camera’ with simultaneously high spatial and temporal resolution to catch the atomic dynamics is required. The pump-probe technique based on femtosecond pump laser with a electron pulse probe can provide a basic framework for realizing such an ‘ultrafast camera’ although this technology has not achieved its full utility as a universal imaging and spectroscopy tool, due to limitations in generation and preservation of a high–brightness electron beam in the ultrafast regime. To realize the high-brightness electron pulse, the major challenge is overcoming strong Coulomb repulsion among electrons (space-charge effect) in the pulse, because the space–charge effect causes the electron pulse expansion in transverse and longitudinal direction. In this seminar, the high-brightness ultrafast electron beam physics will be introduced with the major components, (1) photoelectron gun, (2) magnetic lenses, and (3) an RF compressor controlling the space-charge effect along transverse and longitudinal direction respectively, and the previous studies about photo-induced surface charge dynamics and structural phase transition in graphene and VO2 will be presented.

번호 제목 날짜 조회 수
공지 2019학년도 2학기 콜로퀴움 일정 2019.07.17 76078
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 161227
587 <5/16(Thu.) 14:00 ~ >The Chiral anomaly without Landau levels 2019.05.08 4298
586 <May.8(Wed.)> Genesis of Matter 2019.05.01 5258
585 <May.1(Wed.)> Introduction of AMS Application 2019.04.24 5524
584 <April.17(Wed.)> Emerging Artificial Synapse for Learning- and Energy-Efficient Neuromorphic System 2019.04.11 5475
583 <April.10(Wed.)> 자성 반데르발스 물질 발견과 전망(Discovery and Perspective of magnetic van der Waals materials) 2019.04.04 5527
582 <April.3(Wed.)> 전자구조계산을 이용한 새로운 양자물질 연구 2019.03.27 5524
» <Mar.27(Wed.)> Ultrafast Movie Maker for Photo-induced Dynamics: Ultrafast Electron Microscope 2019.03.20 5820
580 <Mar.20(Wed.)> Connecting Thermoelectricity and Superconductivity by Pressure Bridge 2019.03.13 6021
579 <Mar.13(Wed.)> Physics in Medicine: Magnetic Resonance Imaging 2019.03.07 5809
578 <3/11(Mon) 10:30 am ~ >Probing Dark Matter at LIGO and Beyond 2019.03.04 4667
577 <2/8(Fri) 11:0 am ~ >Intertwined states in the pure and Nd-doped heavy fermion superconductor CeCoIn5 2019.02.08 4677
576 <2/8(Fri) 2:00pm ~ > 5d SCFTs and Type IIB 5-brane webs 2019.02.01 4624
575 <1/16(Wed) 4:00pm> Band Representation Analysis of Intersecting Nodal Rings in Semiconducting Layers 2019.01.09 4768
574 2019학년도 1학기 콜로퀴움 일정 2019.01.08 32414
573 <12/21(Fri) 3:00pm ~ > Quasilocal Smarr Relations / Expanding Universe and Dynamical Compactification Using Yang-Mills Instantons 2018.12.17 5159
572 <12/20(Thu) 2:00pm> Gravitating Spinning Stars (a particle theorist's perspective) 2018.12.17 4934
571 <Dec.12(Wed.)> First-principles studies of complex oxides interfaces 2018.12.05 5511
570 <Dec.5(Wed.)> 두 펄사 이야기 2018.11.28 5542
569 <11/21(Wed.) 2:00pm>Origin of Hawking Radiation 2018.11.20 4906
568 <11/23(Fri.) 11:00am>Barrier-bound States in Flat-band Systems 2018.11.19 4951