First observation of Spin-Momentum helical locking in Bi$_{2}$Se$_{3}$ and Bi$_{2}$Te$_{3}$, demonstration of Topological-Order at 300K and a realization of topological-transport-regime D. Hsieh, 1 Y. Xia, 1 D. Qian, 1, 2 L.A. Wray, 1 J. H. Dil, 3, 4 F. Meier, 3, 4 J. Osterwalder, 4 L. Patthey, 3 J. G. Checkelsky, 1 N. P. Ong, 1 A. V. Fedorov, 5 H. Lin, 6 A. Bansil, 6 D. Grauer, 7 Y. S. Hor, 7 R. J. Cava, 7 and M. Z. Hasan 1, 8 $^{1}$Joseph Henry Laboratories of Physics, Department of Physics, Princeton University, Princeton, NJ 08544, USA $^{2}$Department of Physics, Shanghai Jiao Tong University, Shanghai 200030, China $^{3}$Swiss Light Source, Paul Scherrer Institute, CH-5232, Villigen, Switzerland $^{4}$Physik-Institut, Universit¨ at Z¨ urich-Irchel, 8057 Z¨ urich, Switzerland $^{5}$Advanced Light Source, Lawrence Berkeley Laboratory, Berkeley, CA 94720, USA $^{6}$Department of Physics, Northeastern University, Boston, MA 02115, USA $^{7}$Department of Chemistry, Princeton University, Princeton, NJ 08544, USA $^{8}$Princeton Center for Complex Materials, Princeton University, Princeton NJ 08544, USA ∗ ∗ Electronic address: mzhasan@Princeton.edu 1 arXiv:1001.1590v1 [cond-mat.mes-hall] 11 Jan 2010 Theoretical and experimental discovery of single-Dirac-cone topological-insulator class was reported in the same paper at arXiv:0812.2078 (2008) [http://arxiv.org/abs/0812.2078]. Perspectives and Published version at Y. Xia et.al., Nature Physics 5, 398-402 (2009) [http://dx.doi.org/10.1038/nphys1294].