[Li, X.; Huang, G.; Sun, X.; Xiao, L.] Cent China Normal Univ, Dept Phys, Wuhan 430079, Hubei, Peoples R China.
[Gong, D.; Yang, D.; Ye, J.; Xiang, A. C.; Li, X.; Wang, J.; Liu, T.; Guo, D.; Sun, Q.; Xiao, L.; Liu, C.] Southern Methodist Univ, Dept Phys, Dallas, TX 75275 USA.
[Chen, J.; Fan, Q.; Feng, Y.] Univ Houston, Dept Elect & Comp Engn, Houston, TX 77004 USA.
[He, H.] Shenzhen Polytech, Shenzhen 518055, Peoples R China.
[Hou, S.; Teng, P. -K.] Acad Sinica, Inst Phys, Taipei 11529, Taiwan.