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 2018.07.03 986
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 53231
514 <7/24(Mon.)11:00>Antenna Arrays for Astroparticle Physics: Radio Detection of High-Energy Cosmic Rays 2017.07.19 2057
» <7/20(Thu.)14:00>Engineering and probing topological properties of Dirac semimetal films by asymmetric charge transfer 2017.07.18 1958
512 2017학년도 2학기 콜로퀴움 일정 2017.07.04 12960
511 <June 14(Wed.) 4:30 PM> Stellar core collapse: success or failure, and future probes 2017.06.08 2978
510 <June 7(Wed.) 4:30 PM> 물리학으로 보는 인간과 사회 2017.05.31 3394
509 <May 31(Wed.) 4:30 PM>중력파, 새로운 천문학과 물리학의 시작 2017.05.24 3913
508 <May 24(Wed.) 4:30 PM>누구나 과학을 통찰하는 법 2017.05.17 3589
507 <May 17(Wed.) 4:30 PM>Printed Electronics 2017.05.10 4026
506 <May 10(Wed.) 4:30 PM>Trend and beyond of semiconductor technology (반도체 미세화 및 신기술 동향) 2017.05.04 3944
505 <April. 12 (Wed.) 4:30 PM>디랙물질을 통해서 본 강상관 계의 양자 홀로그래피적 조명: 2017.04.05 4261
504 <4/5(Wed.) 18:00pm> 저에너지 가속기의 활용 2017.04.05 4162
503 <4/5(Wed.) 11:00am>Adhesion forces between nanoparticles in gas-phase processes and application 2017.04.03 4137
502 <April. 5 (Wed.) 4:30 PM>Majorana quasiparticles emergent in Kitaev quantum magnets 2017.03.31 4401
501 <Mar. 29(Wed.) 4:30 PM>Search for New Elements 2017.03.22 4341
500 <Mar. 22(Wed.) 4:30 PM>Symmetry and topology in the electronic structure of solids 2017.03.15 4485
499 <Mar. 15(Wed.) 4:30 PM>반도체 Fab Process와 물리학 전공자 2017.03.14 4286
498 2017학년도 1학기 콜로퀴움 일정 2017.01.05 36454
497 <Dec. 14(Wed.) 4:30 PM>중력과 양자 얽힘 (tentative) 2016.12.07 4961
496 <12/2(Fri.) 14:00>Overview of HIMAC facility 2016.12.01 4967
495 <Dec. 7(Wed.) 4:30 PM>Mechanotransduction of cells in vitro(세포기능의 역학적 조절) 2016.11.30 5021