logo

korean english

게시판

Home > 게시판 > 세미나

고체전자구조계산연구실(김영국 교수님)에서 Virginia Polytechnic Institute and State University의 박경화 교수님을 초청하여 아래와 같이 세미나를 개최합니다.

학과 구성원 여러분의 많은 참석을 부탁드립니다.


○ 일시: 2017년 7월 20일(목) 오후 2:00

○ 장소: 물리학과 세미나실 (제1과학관 3층 31355호)

○ 연사: Prof. Kyungwha Park (Department of Physics, Virginia Polytechnic Institute and State University, USA)

○ Title: Engineering and probing topological properties of Dirac semimetal films by asymmetric charge transfer


○ Abstract: 

Dirac and Weyl semimetals have been under intense investigation due to
topologically protected Weyl nodes and Fermi arc states connecting the
node projections at a surface. Recently, Na3Bi, Cd3As2, PtSe2, and PtTe2
have been experimentally confirmed to be Dirac semimetals (DSMs), where
the Dirac nodes are stabilized by crystal rotational symmetries. In the
presence of an external magnetic field, the DSMs become Weyl semimetals.
In heterostructures involving DSMs, charge transfer may occur at the
interfaces, which can be used to probe and control their bulk and surface
topological properties through surface-bulk connectivity. Here we demonstrate
that despite a band gap in thin DSM films, asymmetric charge transfer at the
surface enables one to accurately identify locations of the Dirac-node
projections from gapless band crossings and to examine and engineer properties
of the topological Fermi-arc surface states connecting the projections, by
simulating adatom-adsorbed DSM films using a first-principles method and by
comparing with the effective model. We show that as the amount of charge
transfer varies, unique spin textures near the projections and a separation
between the Fermi-arc states change. Our results can be observed by top or
bottom gating without adatoms.



번호 제목 날짜 조회 수
공지 2018학년도 2학기 콜로퀴움 일정 2018.07.03 6209
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 64307
527 <Nov.29(Wed.) 4:30 PM> The Intensity Frontier Experiment & SHiP 2017.11.22 1694
526 <Nov.22(Wed.) 4:30 PM> Dark Side of the Universe 2017.11.15 1891
525 <Nov.15(Wed.) 4:30 PM> Mixed metal oxide films for energy and memory device applications 2017.11.08 1929
524 <Nov. 8(Wed.) 4:30 PM> 연성물질 기반 위상학적 결함구조의 상전이와 응 2017.11.01 1449
523 <Nov. 1(Wed.) 4:30 PM> 광자와 이온트랩을 이용한 양자 정보처리 2017.10.25 1964
522 <Oct. 18(Wed.) 4:30 PM> AlGaN/GaN HEMT 센서플랫폼 (KANCSensGaNTM) 기술 소개 file 2017.10.11 2176
521 <Oct. 11(Wed.) 4:30 PM> Graphene Membrane for Imaging Molecular Assembly and Dynamics 2017.09.27 2231
520 <Sep. 27(Wed.) 4:30 PM> Triboelectric and Piezoelectric Nanogenerators for Self-Powered Electronics 2017.09.20 2655
519 <Sep. 20(Wed.) 4:30 PM> 양자이론에 대한 `서울해석` 시도하기 2017.09.13 2009
518 <Sep. 13(Wed.) 4:30 PM> 우주론 100년, 어디로 가고 있는가? 2017.09.06 2040
517 <Sep. 6(Wed.) 4:30 PM> Particles in the Universe 2017.09.01 2481
516 <8/30(Wed.)10:30>​Technology convergence and applications of Large-Area Electronics, e-Textiles, bio-sensors and bio-electronics 2017.08.29 2460
515 <8/21(Mon.)10:30>Non-Gaussianity as a Particle Detector 2017.08.17 2321
514 <7/24(Mon.)11:00>Antenna Arrays for Astroparticle Physics: Radio Detection of High-Energy Cosmic Rays 2017.07.19 2790
» <7/20(Thu.)14:00>Engineering and probing topological properties of Dirac semimetal films by asymmetric charge transfer 2017.07.18 2566
512 2017학년도 2학기 콜로퀴움 일정 2017.07.04 14616
511 <June 14(Wed.) 4:30 PM> Stellar core collapse: success or failure, and future probes 2017.06.08 3866
510 <June 7(Wed.) 4:30 PM> 물리학으로 보는 인간과 사회 2017.05.31 4184
509 <May 31(Wed.) 4:30 PM>중력파, 새로운 천문학과 물리학의 시작 2017.05.24 4650
508 <May 24(Wed.) 4:30 PM>누구나 과학을 통찰하는 법 2017.05.17 4460