| Autor: |
Zeng, Xu-Tao, Liu, Bin-Bin, Yang, Fan, Zhang, Zeying, Zhao, Y. X., Sheng, Xian-Lei, Yang, Shengyuan A. |
| Rok vydání: |
2023 |
| Předmět: |
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| Druh dokumentu: |
Working Paper |
| Popis: |
The real Chern insulator state, featuring nontrivial real Chern number and second-order boundary modes, has been revealed in a few two-dimensional systems. The concept can be extended to three dimensions (3D), but a proper material realization is still lacking. Here, based on first-principles calculations and theoretical analysis, we identify the recently synthesized bulk ${\gamma}$-graphyne as a 3D real Chern insulator. Its nontrivial bulk topology leads to topological hinge modes spreading across the 1D edge Brillouin zone. Under compression of the interlayer distance, the system can undergo a topological phase transition into a real nodal-line semimetal, which hosts three bulk nodal rings and topological boundary modes on both surfaces and hinges. We also develop a minimal model which captures essential physics of the system. |
| Databáze: |
arXiv |
| Externí odkaz: |
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