Higher-order topological Anderson insulator on the Sierpiński lattice

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外文摘要：Disorder effects on topological materials in integer dimensions have been extensively explored in recent years.How-ever,its influence on topological systems in fractional dimensions remains unclear.Here,we investigate the disorder effects on a fractal system constructed on the Sierpiński lattice in fractional dimensions.The system supports the second-order topological insulator phase characterized by a quantized quadrupole moment and the normal insulator phase.We find that the second-order topological insulator phase on the Sierpiński lattice is robust against weak disorder but suppressed by strong disorder.Most interestingly,we find that disorder can transform the normal insulator phase to the second-order topological insulator phase with an emergent quantized quadrupole moment.Finally,the disorder-induced phase is further confirmed by calculating the energy spectrum and the corresponding probability distributions.

外文关键词：

fractal systemtopological insulator

作者：

陈焕、刘峥嵘、陈锐、周斌

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作者单位：

Department of Physics,Hubei University,Wuhan 430062,China

Key Laboratory of Intelligent Sensing System and Security of Ministry of Education,Hubei University,Wuhan 430062,China

基金：

R.C.acknowledges the support of the National Natural Science Foundation of ChinaChutian Scholars Program in Hubei Province.B.Z.was supported by the National Natural Science Foundation of Chinaprogram of outstanding young and middleaged scientific and technological innovation team of colleges and universities in Hubinnovation group project of the Natural Science Foundation of Hubei Province of China

项目编号：

1230419512074107T2020001351342

出版年：

2024

DOI：

10.1088/1674-1056/ad09d4

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(1)

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