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DOI	10.1016/j.scib.2021.04.006
	Direct dynamical characterization of higher-order topological phases with nested band inversion surfaces
	Li L.; Zhu W.; Gong J.
发表日期	2021
ISSN	20959273
起始页码	1502
结束页码	1510
卷号	66 期号:15
英文摘要	Higher-order topological phases (HOTPs) are systems with topologically protected in-gap boundary states localized at their (d-n)-dimensional boundaries, with d the system dimension and n the order of the topology. This work proposes a dynamics-based characterization of one large class of Z-type HOTPs without specifically relying on any crystalline symmetry considerations. The key element of our innovative approach is to connect quantum quench dynamics with nested configurations of the so-called band inversion surfaces (BISs) of momentum-space Hamiltonians as a sum of operators from the Clifford algebra (a condition that can be partially relaxed), thereby making it possible to dynamically detect each and every order of topology on an equal footing. Given that experiments on synthetic topological matter can directly measure the winding of certain pseudospin texture to determine topological features of BISs, the topological invariants defined through nested BISs are all within reach of ongoing experiments. Further, the necessity of having nested BISs in defining higher-order topology offers a unique perspective to investigate and engineer higher-order topological phase transitions. © 2021 Science China Press
关键词	Band inversion surface Dimension reduction Higher-order topology Quench dynamics Topological quantum phases
英文关键词	Algebra; Dynamics; Hamiltonians; Textures; Band inversion; Band inversion surface; Dimension reduction; Dynamical characterization; High-order; High-order topology; Higher-order; Quench dynamic; Topological phase; Topological quantum phase; Topology
语种	英语
来源期刊	Science Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207465
作者单位	Guangdong Provincial Key Laboratory of Quantum Metrology and Sensing & School of Physics and Astronomy, Sun Yat-sen University (Zhuhai Campus), Zhuhai, 519082, China; Department of Physics, National University of Singapore, Singapore, 117542, Singapore
推荐引用方式 GB/T 7714	Li L.,Zhu W.,Gong J.. Direct dynamical characterization of higher-order topological phases with nested band inversion surfaces[J],2021,66(15).
APA	Li L.,Zhu W.,&Gong J..(2021).Direct dynamical characterization of higher-order topological phases with nested band inversion surfaces.Science Bulletin,66(15).
MLA	Li L.,et al."Direct dynamical characterization of higher-order topological phases with nested band inversion surfaces".Science Bulletin 66.15(2021).