logo

korean english

게시판

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 1090298
618 <12/19> The BLG Theory in Light-Cone Superspace 2009.12.15 103020
617 <1/28> Steps towards a non-relativistic AdS/CFT 2010.01.25 126414
616 <2/1> The Surface Science of Adsorption on Crystalline Ferroelectric Polymer Surfaces 2010.01.25 115119
615 <2/16>Development of Micromegas detectors for neutron physics 2010.02.01 119119
614 <4/2> Supersymmetric vacua of mass-deformed M2-brane theory 2010.03.29 92866
613 <4/27> Organic-based Magnet and Organic-based spintronics : New science and Technologies 2010.04.22 123410
612 <5/26>BK21 물리연구단 석학초빙 특별 세미나 2010.05.17 171053
611 <6/18> A consistent truncation of D=11 supergravity to D=4, N=2 supergravity using wrapped M5-branes 2010.06.10 101108
610 <7/9> Strange Metallic Behavior in Anisotropic Background 2010.07.01 172217
609 <7/28> NQR/NMR study on a single crystal of LiFeAs 2010.07.20 117867
608 <7/21> Next generation cryogenic free 1.5T MgB2-magnet based MRI 2010.07.20 90350
607 <8/4> Remarks on the Scalar Graviton and Consistency of Horava Gravity 2010.07.28 107092
606 <8/17> AdS Black Hole Solutions in Extended New Massive Gravity 2010.08.16 122525
605 <9/1> 원자핵 자기공명(Nuclear Magnetic Resonance) 해설 - 원자선에서 영상까지 2010.08.30 99291
604 <10/15> How can population pyramids be used to explore the past? 2010.10.14 116158
603 <11/5> Discussion on recent observation of cosmological dipole of alpha 2010.11.04 172029
602 <11/26> Effective Holographic Theories for Condensed Matter Systems 2010.11.23 119631
601 <11/29> Kahler Inflation and WMAP7 data - a top down approach to Cosmology 2010.11.25 112314
600 <12/21> Special Seminar by Professor Ilya Vekhter 2010.11.30 260623
599 <1/24> Basics of Gravitational Perturbatiosn 2011.01.19 111642