Back to Search
Start Over
Two-dimensional second-order topological insulator in graphdiyne
- Source :
- Phys. Rev. Lett. 123, 256402 (2019)
- Publication Year :
- 2019
-
Abstract
- A second-order topological insulator (SOTI) in $d$ spatial dimensions features topologically protected gapless states at its $(d-2)$-dimensional boundary at the intersection of two crystal faces, but is gapped otherwise. As a novel topological state, it has been attracting great interest, but it remains a challenge to identify a realistic SOTI material in two dimensions (2D). Here, based on combined first-principles calculations and theoretical analysis, we reveal the already experimentally synthesized 2D material graphdiyne as the first realistic example of a 2D SOTI, with topologically protected 0D corner states. The role of crystalline symmetry, the robustness against symmetry-breaking, and the possible experimental characterization are discussed. Our results uncover a hidden topological character of graphdiyne and promote it as a concrete material platform for exploring the intriguing physics of higher-order topological phases.<br />Comment: 6 pages, 5 figures
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. Lett. 123, 256402 (2019)
- Publication Type :
- Report
- Accession number :
- edsarx.1904.09985
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevLett.123.256402