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 2020학년도 1학기 콜로퀴움 일정 2020.01.31 206262
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 529543
597 <8/30(Fri) 16:00 ~ >Structures of light neutron-rich nuclei, 17,19C 2019.08.22 20944
596 <8/26(Mon) 14:00 ~ >Constructing viable models of bouncing scenarios 2019.08.20 21062
595 <8/19(Mon) 13:30 ~ >Detection of cosmic rays in the PeV to EeV energy range file 2019.08.16 21320
594 <8/14(Wed.)>3D-strain induced superconductivity in La2CuO4+δ using a simple vertically aligned nanocomposite approach 2019.08.13 21744
593 <8/19(Mon) 14:00 ~ >Exploring topological matter in an atomic quantum simulator file 2019.07.26 22387
592 2019학년도 2학기 콜로퀴움 일정 2019.07.17 379131
591 <June.12(Wed.)> Ribocomputing: Cellular Logic Computation using RNA Devices file 2019.06.07 24850
590 <June.5(Wed.)> Fluid gravity duality 2019.05.29 24322
589 <May.22(Wed.)> Introduction to exotic quantum states in solids 2019.05.15 24156
588 <May.15(Wed.)> Three-body problems and three-body forces in Classic and Quantum Systems 2019.05.08 24136
587 <5/16(Thu.) 14:00 ~ >The Chiral anomaly without Landau levels 2019.05.08 22113
586 <May.8(Wed.)> Genesis of Matter 2019.05.01 24061
585 <May.1(Wed.)> Introduction of AMS Application 2019.04.24 24568
584 <April.17(Wed.)> Emerging Artificial Synapse for Learning- and Energy-Efficient Neuromorphic System 2019.04.11 24106
583 <April.10(Wed.)> 자성 반데르발스 물질 발견과 전망(Discovery and Perspective of magnetic van der Waals materials) 2019.04.04 23782
582 <April.3(Wed.)> 전자구조계산을 이용한 새로운 양자물질 연구 2019.03.27 24335
» <Mar.27(Wed.)> Ultrafast Movie Maker for Photo-induced Dynamics: Ultrafast Electron Microscope 2019.03.20 26894
580 <Mar.20(Wed.)> Connecting Thermoelectricity and Superconductivity by Pressure Bridge 2019.03.13 25800
579 <Mar.13(Wed.)> Physics in Medicine: Magnetic Resonance Imaging 2019.03.07 28239
578 <3/11(Mon) 10:30 am ~ >Probing Dark Matter at LIGO and Beyond 2019.03.04 22155