logo

korean english

게시판

Home > 게시판 > 세미나

아래와 같이 콜로퀴움을 개최하오니 많이 참석해 주시기 바랍니다. 4시 20분부터 2층 라운지세미나실에 다과를 준비하오니 많은 참석 부탁드립니다 아 래 제목: Fractional Hall Physics of Epitaxial Graphene: Scanning Tunneling Spectroscopy Study at 20 mK with High Magnetic Field 연사: 송 영 재 박사(National Institute of Standards and Technology ) 일시: 2010년 3월 26일(금) 오후4:30 장소: 물리학과 세미나실(31355호실) 초록: Graphene, two dimensional carbon system sharing the same mother form with C60 and carbon nanotubes, is an ideal two dimensional electron system (2DES) with one atomic thickness and has unique electronic properties unlike any other materials yet studied [1]. Completely new physics emerges when quantum interactions dominate as graphene’s relativistic electrons are put under the extreme conditions of low temperatures and high magnetic fields [2,3]. Here I introduce the first scanning tunnelling spectroscopy measurements for the electron density of states of graphene in fields up to 14 T and at temperatures below 20 mK [4] by an ultra low temperature scanning tunneling microscope [5] that I constructed recently in NIST. The Landau levels, peaks in the density of states in a magnetic field, split into a quartet of states as both spin and valley (pseudo-spin) degeneracies are lifted. The valley splitting is much larger than the spin splitting and both show evidence of strong quantum exchange interaction effects. At particular fields when N=1 landau level peak locates on the Fermi level, the spectroscopy shows evidence of a new series of fractional quantum Hall states such as filling factors of 11/2, 9/2 and 7/2 as well as enhanced spin/valley splitting by exchange coupling. The spatial mapping for graphene’s even-filling, polarized odd-filling and fractional-filling states will be addressed, which has been a key issue as a phase-driven problem in 2DES for last decades.
번호 제목 날짜 조회 수
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 1079785
111 <June 14(Wed.) 4:30 PM> Stellar core collapse: success or failure, and future probes 2017.06.08 70332
110 2017학년도 2학기 콜로퀴움 일정 2017.07.04 108163
109 <Sep. 6(Wed.) 4:30 PM> Particles in the Universe 2017.09.01 47055
108 <Sep. 13(Wed.) 4:30 PM> 우주론 100년, 어디로 가고 있는가? 2017.09.06 47888
107 <Sep. 20(Wed.) 4:30 PM> 양자이론에 대한 `서울해석` 시도하기 2017.09.13 47304
106 <Sep. 27(Wed.) 4:30 PM> Triboelectric and Piezoelectric Nanogenerators for Self-Powered Electronics 2017.09.20 76412
105 <Oct. 11(Wed.) 4:30 PM> Graphene Membrane for Imaging Molecular Assembly and Dynamics 2017.09.27 50837
104 <Oct. 18(Wed.) 4:30 PM> AlGaN/GaN HEMT 센서플랫폼 (KANCSensGaNTM) 기술 소개 file 2017.10.11 53731
103 <Nov. 1(Wed.) 4:30 PM> 광자와 이온트랩을 이용한 양자 정보처리 2017.10.25 46388
102 <Nov. 8(Wed.) 4:30 PM> 연성물질 기반 위상학적 결함구조의 상전이와 응 2017.11.01 115548
101 <Nov.15(Wed.) 4:30 PM> Mixed metal oxide films for energy and memory device applications 2017.11.08 62776
100 <Nov.22(Wed.) 4:30 PM> Dark Side of the Universe 2017.11.15 69752
99 <Nov.29(Wed.) 4:30 PM> The Intensity Frontier Experiment & SHiP 2017.11.22 46363
98 <Dec.6(Wed.) 4:30 PM> 실험핵천체물리학: 과거와 미래(Experimental Nuclear Astrophysics: Past and Future) 2017.11.29 45602
97 <Dec.13(Wed.) 4:30 PM>기본에 충실하고 새로움에 도전한다 - 자율주행자동차의 핵심 기술들 – 2017.12.07 56772
96 2018학년도 1학기 콜로퀴움 일정 2018.01.03 110598
95 <Mar.7(Wed.) 4:30 PM>Acoustic metamaterial: principles and applications of phononic crystals 2018.03.02 46149
94 <Mar.21(Wed.) 4:30 PM>깊은 땅속 중성미자 실험, DUNE 2018.03.14 46566
93 <Mar.28(Wed.) 4:30 PM>우주의 번개와 천둥 2018.03.27 45169
92 <April.4(Wed.) 4:30 PM>From Static to Dynamic Multiferroics 2018.03.29 77572