[1] Y. Li, H. Pan, and P. Xu, Acta Phys. Sin. 54, 317 (2005).
[2] A. Hass Bar-Ilan, S. Zamir, O. Katz, B. Meyler, and J. Salzman, Mater, Sci. Eng. A 302, 14 (2001).
[3] H. Zhao, G. Liu, and N. Tansu, Appl. Phys. Lett. 97, 131114 (2010).
[4] W. W. Chow, Opt. Express 19, 21818 (2011).
[5] R. M. Farrell, P. S. Hsu, D. A. Haeger, K. Fujito, S. P. DenBaars, J. S. Speck, and S. Nakamura, Appl. Phys. Lett. 96, 231113 (2010).
[6] J. Zhang, H. Zhao, and N. Tansu, Appl. Phys. Lett. 98, 171111 (2011).
[7] X. Wang, B. Chang, Y. Du, and J. Qiao, Appl. Phys. Lett. 99, 042102 (2011).
[8] X. Wang, B. Chang, L. Ren, and P. Gao, Appl. Phys. Lett. 98, 082109 (2011).
[9] H. Zhao, G. Liu, J. Zhang, J. D. Poplawsky, V. Dierolf, and N. Tansu, Opt. Express 19, A991 (2011).
[10] J. Zhang, H. Tong, G. Liu, J. A. Herbsommer, G. Huang, and N. Tansu, J. Appl. Phys. 109, 053706 (2011).
[11] C. Li, S. Dang, and P. Han, Acta Opt. Sin. (in Chinese) 30, 1406 (2010).
[12] J. Li, X. Zeng, Z. Ji, Y. Hu, B. Chen, and Y. Fan, Acta Phys. Sin. 60, 057101 (2011).
[13] Y. Shen and J. Kang, Acta Phys. Sin. 51, 645 (2002).
[14] C. Pang, J. Shi, Y. Zhang, K. S. A. Butcher, T. L. Tansley, J. E. Downes, and J. Shang, Chin. Phys. Lett. 24, 2048 (2007).
[15] W. Jie and C. Yang, Journal of Sichuan Normal University (Natural Science) 33, 803 (2010).
[16] M. D. Segall, P. J. D. Lindan, M. J. Probert, C. J. Pickard, P. J. Hasnip, S. J. Clark, and M. C. Payne, J. Phys.: Condens. Matter 14, 2717 (2002).
[17] J. P. Perdew and A. Zunger, Phys. Rev. B 23, 5048 (1981).
[18] J. P. Perdew, K. Burke, and M. Ernzerhof, Phys. Rev. Lett. 77, 3865 (1996).
[19] H. J. Monkhorst and J. D. Pack, Phys. Rev. B 13, 5188 (1976).
[20] R. Fang, Spectroscopy of solid (in Chinese) (China University of Science and Technology Press, Hefei, 2001).
[21] X. Sheng, The Spectrum and Optical Property of Semiconductor (in Chinese) (Science Press, Beijing, 2002).
[22] Q. Chen, Q. Xie, and W. Yan, Science in China (Series G) 38, 825 (2008).
[23] P. Perlin, C. Jauberthie-Carillon, J. P. Itie, A. San Miguel, I. Grzegory, and A. Polian, Phys. Rev. B 45, 83 (1992).
[24] J. Guo, G. Zheng, K. He, and J. Chen, Acta Phys. Sin. 57, 3740 (2008).
[25] F. Ke, X. Fu, G. Duan, S. Wu, S. Wang, L. Chen, and Y. Jia, J. Infrared Millim. Waves 30, 212 (2011).
[26] T. Kawashima, H. Yoshikawa, S. Adachi, S. Fuke, and K. Ohtsuka, J. Appl. Phys. 82, 3528 (1997).