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 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 1090785
118 <5/14> Search for exotic materials: strongly correlated electron system 2010.05.10 120798
117 <12/4> The "Physics" of Climate Change 2009.12.02 121021
116 <Nov. 8(Wed.) 4:30 PM> 연성물질 기반 위상학적 결함구조의 상전이와 응 2017.11.01 121898
115 <July 7(Wed.)>Functional rare earth ionic defects and the related phenomena 2021.07.02 122058
114 <6/11(Mon.)3:30pm> Spontaneous Leptogenesis in Continuum-Clockwork Axion Models 2018.06.08 122499
113 <8/17> AdS Black Hole Solutions in Extended New Massive Gravity 2010.08.16 122726
112 <6/18> Multiferroics: Magnetism-driven Ferroelectricity 2009.05.27 123015
111 <7/24(Mon.)11:00>Antenna Arrays for Astroparticle Physics: Radio Detection of High-Energy Cosmic Rays 2017.07.19 123172
110 <4/27> Organic-based Magnet and Organic-based spintronics : New science and Technologies 2010.04.22 123508
109 <May 17(Wed.) 4:30 PM>Printed Electronics 2017.05.10 123826
108 <8/5>Brane superpotential via local Calabi-Yau spaces 2009.08.03 123933
107 <3/31> ZnO nanorod heterostructures and nanodevices 2006.03.27 124712
106 <4/30> Updates on warped brane inflation 2009.04.21 125591
105 <11/13(Tue.) 11:00am>Hund’s coupling driven role of $d_{3z^2-r^2}$ in stabilizing the hole-doped antiferromagnetic state in cuprates 2018.11.09 125876
104 <5/15>Black Hole Entropy Function in (Anti-)de Sitter Space-Time 2008.05.09 125916
103 <Sep. 29(Wed.)> Longitudinal Spin Seebeck effect in Pt/YIG structure with monolayer WSe2 and MoS2 interlayer 2021.09.16 126169
102 <1/28> Steps towards a non-relativistic AdS/CFT 2010.01.25 126476
101 <Oct.15(Thu) 16:30> Single-Molecule Approach to Homology Search & Strand Exchange in Homologous Recombination 2015.10.12 127211
100 <3/26> Fractional Hall Physics of Epitaxial Graphene: 2010.03.19 127406
» <7/20(Thu.)14:00>Engineering and probing topological properties of Dirac semimetal films by asymmetric charge transfer 2017.07.18 127584