| Autor: |
Cai, Duanjun, Guo, Guang-Yu |
| Rok vydání: |
2009 |
| Předmět: |
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| Zdroj: |
J. Phys. D: Appl. Phys. 42 (2009) 185107 |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1088/0022-3727/42/18/185107 |
| Popis: |
We study the linear and nonlinear optical properties of wurtzite GaN under c-axial stress field, using density functional theory calculations. The fully structural optimization at each c-axial strain was performed. The calculated dielectric functions show that tensile c-axial strain effectively improves the linear optical efficiency, especially for the band-edge transitions, and significantly increase the mobility of electrons in the conduction band. Second-order nonlinear optical susceptibilities show that the tensile c-axial strain will enhance the zero- and low-frequency nonlinear responses of GaN. The enhancement of the nonlinear optical property is explained by the reduction of the polarization of wurtzite GaN under tensile c-axial strains. Based on these findings, we propose a method for improving the electrical and optical properties of the crystal through imposing appropriate stress on the high symmetry crystalline directions. |
| Databáze: |
arXiv |
| Externí odkaz: |
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