| Autor: |
Wanqing Cheng, Feng Zhai |
| Jazyk: |
angličtina |
| Rok vydání: |
2023 |
| Předmět: |
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| Zdroj: |
Results in Physics, Vol 51, Iss , Pp 106739- (2023) |
| Druh dokumentu: |
article |
| ISSN: |
2211-3797 |
| DOI: |
10.1016/j.rinp.2023.106739 |
| Popis: |
Recently, γ−graphyne has been recognized as a two-dimensional high-order topological insulator with typical corner states. In this work, we examine the condition for the existence of corner states in a hexagonal quantum dot made of γ−graphyne (GYQD). Based on a single-orbital tight-binding model, we find that corner states appear only when there are partially-bonding carbon atoms located at the corners. This indicates a potential instability of corner states. As the size of GYQDs increases, mid-gap states in the energy spectrum are either prohibited or exhibited as corner-only or edge-only states. Additionally, we find that the light absorption of GYQDs has a relatively weak polarization anisotropy. The presence of corner states leads to the emergence of sub-gap absorption and enhancement of above-gap absorption. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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