korean english


Home > 게시판 > 세미나

양자물질초전도연구실에서 미국 로스알라모스 국립연구소에 스태프로 재직중인 Shizeng Lin 박사님을 초청하여 아래와 같이 세미나를 개최합니다.

학과 구성원 여러분의 많은 참석을 부탁 드립니다.


Date/time: 2019. 09. 17(Tue.) 16:00


Place: Creative Room on 7th Floor of Samsung Library


Speaker: Dr. Shizeng Lin (Los Alamos National Laboratory)


Title: Dynamics of multiple-Q spin textures and its effect on electronic state


Abstract: Multiple-Q spin textures, such as magnetic bubble and skyrmion lattices, have been observed in a large family of magnets. These spin textures can be driven into motion by external stimuli. In this talk, first, I will give an overview about the spin textures in magnets. I will also discuss the dynamics of the spin texture under various drives such as electric current/thermal gradient.  The main part of the talk will focus on the effect of the motion of spin textures on the electronic states. We show that to describe correctly the electronic dynamics, the momentum space needs to be transcended to higher dimensions by including the ancillary dimensions associated with phason modes of the translational motion of the spin textures. The electronic states have non-trivial topology characterized by the first and second Chern numbers in the high dimensional hybrid momentum space. This gives rise to an anomalous electric charge transport due to the motion of spin textures. By deforming the spin textures, a nonlinear response associated with the second Chern number can be induced and results in the piezoelectricity. The charge transport is derived from the semi-classical equation of motion of electrons that depends on the Berry curvature in the hybrid momentum space. Our results suggest that the motion of multiple-Q spin textures has significant effects on the electronic dynamics and provides a new platform to explore high dimensional topological physics.

1) Lin et al., Phys. Rev. Lett. 112, 187203 (2014)
2) Lin and Hayami, Phys. Rev. B 93, 064430 (2016)
3) Lin and Batista, Phys. Rev. Lett. 120, 077202 (2018)
4) Su, Hayami and Lin, arXiv:1904.05473 (2019)

번호 제목 날짜 조회 수
공지 2022학년도 1학기 콜로퀴움 일정 2022.01.10 28137
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 974759
620 <10/17> Graphitic Carbon Nanostructures 2008.10.27 100211
619 <5/29> Nanomaterials Work at NASA-Johnson Space Center 2009.05.25 99687
618 <9/25> 청각의 물리학: 어떻게 노이즈를 극복하는가? 2013.09.16 98953
617 <5/27(수) 오후4:30분>Controlling phases in epitaxial transition metal oxide thin films 2015.05.21 98838
616 <4/27> RENO Reactor Neutrino Experiment 2011.04.18 98811
615 <4/4> Novel multi-bit magnetic tagging technique for high-throughput chemical analysis 2008.03.31 98699
614 <12/5> Fluerenes with diversed structures and their applications 2008.12.02 98460
613 <4/21> Experimental and Observational Astrophysics in the Infrared Wavebands 2009.04.17 98347
612 <6/8> 액체금속 및 물의 과냉각 현상과 국소구조와의 관계 : 정전기 공중부양 기술 및 dynamic diamond anvil cell 2011.06.07 98288
611 <10/15> How can population pyramids be used to explore the past? 2010.10.14 98245
610 <12/26> Emergent Physics in 3D Correlated Topological Semimetals file 2013.12.20 98167
609 <7/28> NQR/NMR study on a single crystal of LiFeAs 2010.07.20 98120
608 <11/21> Cosmological viable scalar-tensor theories of gravity 2012.11.16 97553
607 <8/5>Brane superpotential via local Calabi-Yau spaces 2009.08.03 97296
606 <11/9> Bosons in high Tc superconductors: an experimental survey 2011.10.31 97076
605 <Oct. 20(Tue.) 2:00 PM> High-throughput Synthesis of Oxide Thin Films 2015.10.05 97060
604 <3/26> Fractional Hall Physics of Epitaxial Graphene: 2010.03.19 96498
603 <9/11> Complex networks in technology, biology and sociology 2009.09.04 96032
602 <April. 6(Wed.) 4:30 PM> Quantitative Determination of High Tc Superconductivity Mechanism 2016.03.31 95776
601 <12/21(금)> Theory of topological quantum phase transitions in 3D noncentrosymmetric systems 2012.12.05 95622