| Autor: |
Van Long Le, Do Duc Cuong, Hoang Tung Nguyen, Xuan Au Nguyen, Bogyu Kim, Kyujin Kim, Wonjun Lee, Soon Cheol Hong, Tae Jung Kim, Young Dong Kim |
| Jazyk: |
angličtina |
| Rok vydání: |
2020 |
| Předmět: |
|
| Zdroj: |
AIP Advances, Vol 10, Iss 10, Pp 105003-105003-6 (2020) |
| Druh dokumentu: |
article |
| ISSN: |
2158-3226 |
| DOI: |
10.1063/5.0021690 |
| Popis: |
We investigate analytically the anisotropic dielectric properties of single-crystal α-SnS near the fundamental absorption edge by considering atomic orbitals. Most striking is the excitonic feature in the armchair- (b-) axis direction, which is particularly prominent at low temperatures. To determine the origin of this anisotropy, we perform first-principles calculations using the GW0 Bethe–Salpeter equation including the electron–hole interaction. The results show that the anisotropic dielectric characteristics are a direct result of the natural anisotropy of p orbitals. In particular, this dominant excitonic feature originates from the py orbital at the saddle point in the Γ–Y region. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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