Observation of symmetry-protected topological band with ultracold fermions

Science Advances
Bo SongGyu-Boong Jo

Abstract

Symmetry plays a fundamental role in understanding complex quantum matter, particularly in classifying topological quantum phases, which have attracted great interests in the recent decade. An outstanding example is the time-reversal invariant topological insulator, a symmetry-protected topological (SPT) phase in the symplectic class of the Altland-Zirnbauer classification. We report the observation for ultracold atoms of a noninteracting SPT band in a one-dimensional optical lattice and study quench dynamics between topologically distinct regimes. The observed SPT band can be protected by a magnetic group and a nonlocal chiral symmetry, with the band topology being measured via Bloch states at symmetric momenta. The topology also resides in far-from-equilibrium spin dynamics, which are predicted and observed in experiment to exhibit qualitatively distinct behaviors in quenching to trivial and nontrivial regimes, revealing two fundamental types of spin-relaxation dynamics related to bulk topology. This work opens the way to expanding the scope of SPT physics with ultracold atoms and studying nonequilibrium quantum dynamics in these exotic systems.

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Citations

Dec 10, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Ya-Jie WuSu-Peng Kou
Aug 8, 2018·Physical Review Letters·Tsuneya YoshidaNorio Kawakami
Dec 24, 2018·Scientific Reports·Shanchao ZhangGyu-Boong Jo
Feb 6, 2019·Physical Review Letters·Kunkun WangPeng Xue
Nov 26, 2019·Physical Review Letters·Chang-Rui YiJian-Wei Pan
Aug 29, 2020·Physical Review Letters·Yucheng WangXiong-Jun Liu
Sep 8, 2018·Physical Review Letters·E J König, J H Pixley
Jan 5, 2019·Physical Review Letters·Wei SunJian-Wei Pan
Jan 25, 2020·Physical Review Letters·S BarbarinoJ C Budich
Mar 2, 2019·Physical Review Letters·Jeong Ho HanY Shin
Jul 24, 2020·Physical Review Letters·Wentao JiJiangfeng Du
Nov 17, 2020·Physical Review Letters·Long ZhangXiong-Jun Liu
Dec 19, 2020·Physical Review Letters·Johannes Motruk, Ilyoun Na
Nov 21, 2020·Physical Review Letters·Yucheng WangXiong-Jun Liu
Oct 9, 2021·Light, Science & Applications·Danying YuLuqi Yuan
Jan 9, 2022·Light, Science & Applications·Yuqing LiSuotang Jia

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