Structural and electronic properties of Bi and Sn thin films grown on Bi2Te3
| Autor: | Yu-jie Liao, 廖禹傑 |
|---|---|
| Rok vydání: | 2016 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 105 Using first-principles calculations, the electronic structures and topological properties of stanene (Sn) and bismuthene (Bi) bilayers grown Bi2Te3, which are known two-dimensional (2D) and three-dimensional (3D) topological insulators (TIs), were extensive explored in this report. In the case of Sn on Bi2Te3 substrate, the topological surface state of Bi2Te3 is shifted down which results from the n-type doping due to the charge transformation of Sn bilayer. In addition, the gap contributed from Sn bilayer became larger at the K point due to the substrate effect. We further adjusted the distance between Sn bilayer and Bi2Te3 substrate in order to realize the interaction between them. Furthermore, the structural stability of two-bilayer system composed of Sn and Bi bilayers with and without Bi2Te3 substrate was also investigated. A topological semi-metal phase is exhibited when the Sn and Bi bilayer system is placed on the Bi2Te3 substrate. Finally, we presented band structure of Sn and Bi bilayer on the Bi2Te3 as 3D TIs. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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