korean english


Home > 게시판 > 세미나

고체전자구조계산 연구실에서 홍콩과기원 물리학과의 조교붕 교수님을 초청하여 아래와 같이 세미나를 개최합니다.

학과 구성원 여러분의 많은 참석을 부탁 드립니다.


Date/time: 2019. 08. 19(Mon) 14:00


Place: 제1과학관 e+첨단강의실(31214호)


Speaker: 조  규  붕 교수님 (물리학과, 홍콩과기원)


Title: Exploring topological matter in an atomic quantum simulator


Abstract:  An atomic quantum simulator with ultracold atoms enables us to precisely design, characterize and understand various quantum materials on demand. In this talk, I will introduce the recent progress on the experimental realization of topological matter using ultracold atoms, and discuss a few pedagogical topological models. In particular,  I will demonstrate two sets of experiments recently performed at HKUST. First, I will describe the observation of symmetry-protected topological (SPT) phases realized in 1D optical lattices [1]. The observed SPT phase is beyond the Altland-Zirnbauer ten-fold classification, and protected by mirror and a generalized chiral symmetry that can be manipulated in an optical lattice with Raman-induced spin-orbit coupling, with its topology being detected by the spin polarization of Bloch states at highly symmetric points of the Brillouin zone. Secondly, I will discuss the realization of 3D topological band by generalizing the spin-orbit coupling realized in 1D [2]. Despite the significant progresses, the observation of topological band beyond 2D has remained challenging due to the experimental complexity. We developed a novel way to probe 3D band structure in the presence of emergent magnetic group symmetry. This symmetry allows for effectively reconstructing the 3D topological band from a series of measurements of integrated spin textures. As a result, we demonstrate that 3D topological band structure with gapless nodal-lines are realized in simple optical lattice potentials with spin-orbit coupling.  Interestingly, the spin dynamics after the quantum quench from the trivial to topological band reflects the intrinsic band topology of the post-quench Hamiltonian, which will be discussed in details for both 1D [1] and 3D [2] topological bands.

[1]  Bo Song, Long Zhang, Chengdong He, Ting Fung Jeffrey Poon, Elnur Hajiyev, Shanchao Zhang, Xiong-Jun Liu and Gyu-Boong Jo “Observation of symmetry-protected topological band with ultracold fermions”  Science Advances 4, eaao4748 (2018)
[2] Bo Song, Chengdong He, Sen Niu, Long Zhang, Zejian Ren, Xiong-Jun Liu and Gyu-Boong Jo “Observation of nodal-line semimetal with ultracold fermions in an optical lattice”
Nature Physics, in press  (2019).

번호 제목 날짜 조회 수
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 1089854
437 <4/24> How to introduce the monopole in quantum mechanics? 2012.04.23 77425
436 <12/12> lattice structure in holographic models 2012.12.12 77464
435 <9/7(금)> Kondo Effect in Chiral Orbital Bands 2012.08.31 77467
434 <9/15> 2006.09.07 77485
433 <11/10>한국원전중성미자실험(RENO) 2006.11.08 77666
432 <11/10>Mutifunctional Magnetic Oxides (다 기능성 자성 산화물) 2006.11.08 77763
431 <5/15>강상관 전자계의 열전변환 응용 2009.05.08 77822
430 <10/23> Measuring Transfer Reactions with Radioactive Beams 2012.10.15 77913
429 <9/10> Low temperature graphene synthesis 2010.08.30 77968
428 <4/20> Chern-Simons gauge theories and M2 brane CFTs 2009.04.09 78002
427 <11/30> Spinning Black Holes: key to Gamma-ray Bur... 2007.11.26 78169
426 <4/21(월) 오후 2시> Optical properties of iron-based conductors and superconductors 2014.04.15 78212
425 <4/17>고온초전도 2세대 선재 : 현황 및 전망 2009.05.06 78319
424 <11/5> Optical spectroscopic probe on the surface state in three dimensional topological insulators 2012.10.24 78333
423 <4/7(화)> 특별초청세미나 개최 안내 2015.04.01 78364
422 <11/21>Super B factory @ KEK 2008.11.19 78413
421 <3/16> Introduction to Experimental Nuclear Astrophysics 2007.03.15 78474
420 <10/9> 금속 단결정 물성과 자성 반도체 연구 2009.10.06 78485
419 <11/14>Oxide heterostructure and multifunctional devices 2006.11.10 78659
418 <12/6(Fri.)>topological phase transitions in Kitaev quantum spin liquids. 2019.12.04 78698