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: Manipulating spins in topological insulators


Speaker:       박사님 (California NanoSystems Institute, University of California)


Date & Time: Sep. 7(Wed.) 2016, 4:30 PM


Place: Natural Science 1,  Room No. 31214


Abstract: 

In three-dimensional topological insulators, a band inversion by a strong spin-orbit coupling induces metallic surface states in the bulk band gap. The inherently spin-polarized surface state is robust(topologically protected) against back scattering, which has attracted much attention from condensed matter physics and spintronics communities. Indeed, it has been experimentally demonstrated that topological insulators are promising materials for spintronics: a spin-transfer torque of record efficiency was reported[1], and spin pumping measurements suggest a spin Hall angle of a topological insulator is larger than in many currently studied materials [2]. Current issues in topological spintronics include electrical detection and manipulation of the spin-polarized topological surface state. In this talk, I will discuss recent studies of the direct electrical detection of the current-induced spin polarization in topological insulators. A control of spin signals by changing the current direction and by tuning the chemical potential will be demonstrated [3]. I will also discuss a different approach to manipulate the spin-textured surface state by breaking time-reversal symmetry in a topological insulator interfaced with a ferromagnetic semiconductor. The resulting magnetic gap at the Dirac point is evidenced as the chemical potential approaches the Dirac point or as temperature lowers. If time allows, I will briefly talk about another topic of my current studies: epi-superconductor/2D semiconductor hybrid systems towards topological superconductivity and quantum computing applications.


[1] A. Mellnik, J.S.LEE et al., Nature 511, 449 (2014)


[2] M. Jamali, J.S.LEE et al., Nano Lett., 15, 7126 (2015)


[3] J.S.Lee et al., Phys Rev B, 92, 155312 (2015)


번호 제목 날짜 조회 수
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 1090849
418 <3/13(금) pm1:00> 초청세미나 개최 안내 2015.03.09 90963
417 <4/16>같은 곳을 바라보는 다른 시선 2010.04.09 90864
416 <6/9> Status and Prospects of Big Science in Korea 2006.06.05 90779
415 <2/16>Hamiltonian formalism 2011.02.11 90774
414 <10/8 (월)>물리학과 특별세미나 개최 안내 2012.10.05 90765
413 콜로퀴움 강연 일정표 2006.02.21 90737
412 <7월27일>Correlated topological phases in 3D complex oxides via Green's functions 2012.07.27 90699
411 2015학년도 2학기 콜로퀴움 일정 2015.08.06 90614
410 <4/3>Enhanced emission rate from a single quantum well using surface plasmon 2009.03.31 90551
409 <1/17>Quantum criticality and superconductivity 2008.01.16 90528
408 <7/21> Next generation cryogenic free 1.5T MgB2-magnet based MRI 2010.07.20 90398
407 <May.27(Fri.) 10:00> Towards Magnetic 2D Materials 2016.04.27 90298
406 <12/7> Optical Antennas 2011.11.30 90157
405 <7/8> 신물질 고온초전도 초청강연 2009.06.26 89906
404 <10/23> Measuring Transfer Reactions with Radioactive Beams 2012.10.15 89642
403 <Sept.18(Wed.)> Rare-earth: versatility and capability 2019.09.16 89505
402 <10/17> The Interface Induced Magnetism 2012.10.11 89488
401 2011학년도 2학기 콜로퀴움 일정 안내 2011.08.22 89468
400 2008학년도 1학기 콜로퀴움 일정 안내 2008.03.04 89352
399 <Sep.12(Wed.) 4:30 PM> Functional Nanomaterials for Energy Harvesting 2018.09.05 89308