تقرير
The Carbon State in Dilute Germanium Carbides
| العنوان: | The Carbon State in Dilute Germanium Carbides |
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| المؤلفون: | Gulyas, I. A., Stephenson, C. A., Meng, Qian, Bank, S. R., Wistey, M. A. |
| سنة النشر: | 2019 |
| المجموعة: | Condensed Matter Physics (Other) |
| مصطلحات موضوعية: | Condensed Matter - Materials Science, Physics - Computational Physics |
| الوصف: | Conduction and valence band states for the highly mismatched alloy (HMA) Ge:C are projected onto Ge crystal states, Ge vacancy states, and Ge/C atomic orbitals, revealing that substitutional carbon not only creates a direct bandgap, but the new conduction band is optically active. Overlap integrals of the new Ge:C conduction band with bands of pure Ge shows the new band has almost no Ge band character. C sites structurally mimic uncharged vacancies in the Ge lattice, similar to Hjalmarson's model for other HMAs. C perturbs the entire Ge band structure even at the deepest crystal core energy levels. Projection onto atomic sites shows relatively weak localization compared with other HMAs, but does show a strong anisotropy in probability distribution. L-valley conduction band states in Ge are ruled out as major contributors to the carbon state in Ge:C, both by weak inner products between these states and by a negligible effect on optical transition strength when adding C. Comment: 11 pages with references, 5 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1063/1.5112057 |
| الوصول الحر: | http://arxiv.org/abs/1910.07258Test |
| رقم الانضمام: | edsarx.1910.07258 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1063/1.5112057 |
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