Direct dynamical characterization of higher-order topological phases with nested band inversion surfaces

• 作者: Linhu Li Weiwei Zhu Jiangbin Gong
• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2021,（15）
• 所属期刊栏目: Physical Sciences
• 页码范围: 1502-1510
• 页数: 9页
• 语种: 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 topo-logical 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.