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 2022학년도 1학기 콜로퀴움 일정 2022.01.10 812
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 812772
666 <Nov. 29(Mon.)>Exploring light-matter interactions at atomic scale using electron microscopy 2021.11.22 1450
665 <Nov. 17(Wed.)>펜로즈의 삼각형과 블랙홀 - 부분과 전체 2021.11.11 1471
664 <Nov. 10(Wed.)>Optical Spectroscopy of 2-Dimensional Materials 2021.11.03 1566
663 <Dec. 1(Wed.)>Halide Perovskite Single Crystals and Thin Films for Solar Cells and Optoelectronics 2021.11.25 1652
662 <Nov. 5(Fri.)>Strongly Coupled Moire Photonics 2021.11.01 1796
661 <Oct. 27(Wed.)> How interactions shape ecological communities 2021.10.20 1946
660 <Nov. 3(Wed.)>시공간의 구조: 상대성이론, 특이점, 우주상수 2021.10.28 2044
659 <Oct. 6(Wed.)> 블랙홀에서 쌍꺼풀수술까지 2021.09.29 2147
658 <Sep. 15(Wed.)> 강화학습 - 시행착오를 통해 배워나가는 인공지능 2021.09.08 2347
657 <Sep. 8(Wed.)> Utilizing physics to build a trapped-ion quantum computer 2021.09.01 2996
656 <Sep. 29(Wed.)> Longitudinal Spin Seebeck effect in Pt/YIG structure with monolayer WSe2 and MoS2 interlayer 2021.09.16 3132
655 <Oct. 13(Wed.)> Electric Quantum Oscillation: A New Form of Quantum Oscillation 2021.10.06 4421
654 <July 21(Wed.)> Strongly Correlative Ionics 2021.07.19 4498
653 <Aug. 6(Fru.)> Gravitationally probing dark matter (DM) microphysics 2021.08.03 4697
652 <June 30(Wed.)>Mapping of magnetic anisotropy for van der Waals materials 2021.06.25 5266
651 <July 14(Wed.)> B1g phonon anomaly driven by Fermi surface instability at intermediate temperature in YBa2Cu3O7−δ 2021.07.13 5854
650 <April 21(Wed.)> 우주배경복사 편광 관측 - 남극점 기지 바이셉/켁 어레이(BICEP/Keck Array) 망원경 2021.04.12 6175
649 <June 23(Wed.)>Valley Polarization and Exciton Hall Effect in Transition Metal Dichalcogenides 2021.06.22 6818
648 <April 28(Wed.)> 손에 잡히는 AI 2021.04.21 6919