korean english


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


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 1079201
170 <9/5> Dark Matter and Dark Energy in Cosmology 2008.09.01 83537
169 <4/6> Introduction to Superconducting Quantum Electronics 2007.04.03 83653
168 <9/21> Electronic phase transition in low dimensional SrTiO3/(Sr1-x,Lax)TiO3 oxide superlattices 2011.09.09 83976
167 <11/16> 방사선과 그 이용 2007.11.16 83982
166 <11/12(수)> Photovoltaic effect and polarization-modulated conduction in ferroelectrics 2014.11.05 84264
165 <5/2> Electrical Instability in Nanoscale Channel Devices: Top-down & Bottom-up Approaches 2012.04.19 84537
164 <5/4> Kondo effect in nanoscopic devices 2011.04.28 84660
163 <4/14> Neutron Star 2006.04.10 84698
162 <4/4> Cooking up elements in the universe: Nuclear astrophysics with exotic ion beams 2012.03.29 84869
161 <5/25> 나노켈빈 원자 기체의 보즈-아인슈타인 응집 2011.05.18 84978
160 essay 작성요령 2008.03.18 85011
159 2012학년도 1학기 콜로퀴움 일정 안내 [5] 2012.02.29 85152
158 <3/30> Supersolidity in Helium 2011.03.25 85358
157 <3/23> 동서양의 세계관과 풍경화 2011.03.17 85359
156 <Sep.12(Wed.) 4:30 PM> Functional Nanomaterials for Energy Harvesting 2018.09.05 85490
155 <11/7> Two- and three- body problems in classic and quantum mechanics 2012.10.29 85767
» <Sep. 7(Wed.) 4:30 PM>Manipulating spins in topological insulators 2016.09.02 86030
153 <10/12>Nanoimprint lithography and its application... 2007.10.08 86601
152 2008학년도 1학기 콜로퀴움 일정 안내 2008.03.04 87292
151 <5/8> Complex Networks: Through the 3D Looking Glass 2013.05.02 87298