首页|Higher-order topological corner states and origin in monolayer LaBrO

Higher-order topological corner states and origin in monolayer LaBrO

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Intrinsic higher-order topological insulators driven solely by orbital coupling are rare in electronic materials.Here,we propose that monolayer LaBrO is an intrinsic two-dimensional second-order topological insulator.The generalized second-order topological phase arises from the coupling between the 5d orbital of the La atom and the 2p orbital of the O atom.The underlying physics can be thoroughly described by a four-band generalized higher-order topological model.Notably,the edge states and corner states of monolayer LaBrO exhibit different characteristics in terms of morphology,number,and location distribution under different boundary and nanocluster configurations.Furthermore,the higher-order topological corner states of monolayer LaBrO are robust against variations in spin-orbit coupling and different values of Hubbard U.This provides a material platform for studying intrinsic 2D second-order topological insulators.

second order topological insulatorfirst-principles calculationshigher order topological modelzero-dimensional corner state

王庆、郝宁

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Anhui Province Key Laboratory of Low-Energy Quantum Materials and Devices,High Magnetic Field Laboratory,HFIPS,Anhui,Chinese Academy of Sciences,Hefei 230031,China

Science Island Branch of Graduate School,University of Science and Technology of China,Hefei 230026,China

2024

10.1088/1674-1056/ad8a50

中国物理B(英文版)
中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI
影响因子：0.995
ISSN：1674-1056
年,卷(期)：2024.33(12)