[1] Y. P. Zhang, A. W. Brown, and M. Xiao, Opt. Lett. 32, 1120 (2007).
[2] Y. P. Zhang and M. Xiao, Appl. Phys. Lett. 90, 111104 (2007).
[3] Y. P. Zhang, A. W. Brown, and M. Xiao, Phys. Rev. Lett. 99, 123603 (2007).
[4] Y. P. Zhang, B. Anderson, A. W. Brown, and M. Xiao, Appl. Phys. Lett. 91, 061113 (2007).
[5] Y. P. Zhang and M. Xiao, Opt. Express 15, 7182 (2007).
[6] Y. Wu, Phys. Rev. A 71, 053820 (2005).
[7] Y. P. Zhang, B. Anderson, and M. Xiao, J. Phys. B 41, 045502 (2008).
[8] S. E. Harris, Phys. Today 50, (7) 36 (1997).
[9] H. Wang, D. Goorskey, and M. Xiao, Phys. Rev. Lett. 87, 073601 (2001).
[10] M. D. Lukin, S. F. Yelin, M. Fleischhauer, and M. O. Scully, Phys. Rev. A 60, 3225 (1999).