Topological defects and boundary states in four-dimensional topological insulator

• Published in: Europhysics letters Vol. 146; no. 3; pp. 36002 - 36008
• Main Authors: Chang, Zhi-Wen, Hao, Wei-Chang, Liu, Xin
• Format: Journal Article
• Language: English
• Published: Les Ulis EDP Sciences, IOP Publishing and Società Italiana di Fisica 01.05.2024; IOP Publishing
• Subjects: Band theory; Banded structure; Energy bands; Point defects; Topological insulators; Wave functions

We show the connection between the second Chern number and topological defects, in a (4+1)-dimensional time-reversal invariant Dirac lattice model. It is discovered that two types of topological defects, the five-dimensional (5D) and four-dimensional (4D) point defects arise from the singular points...