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

학과 구성원 여러분의 많은 참석을 부탁 드립니다.


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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).

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