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Both the theoretical and experimental discovery of single-Dirac-conetopological-insulator-class was reported at arXiv:0812.2078 (2008) [Y. Xiaet.al., Nature Physics 5, 398-402 (2009)http://www.nature.com/nphys/journal/v5/n6/full/nphys1294.html].  Here we report the first observation of Spin-Momentum Helical Locking andSpin-Vortex structures in Bi2Se3 and Bi2Te3, demonstrate the existence ofTopological-Order at 300K and report a material realization oftopological-transport-regime for helical Dirac fermions. Our results reveal aone-to-one spin-momentum locked Dirac structure in Bi2Se3 and Bi2Te3 that isnearly 100% spin-polarized, which exhibits a tunable topological fermiondensity in the vicinity of the Kramers' point and can be driven to thelong-sought topological-transport-regime. The observed topological nodal Diracground state is found to be protected even up to room temperature (300 K). Ourresults pave the way for future transport based studies of topologicalinsulators, and possible room temperature applications of protectedspin-polarized edge channels we observe with spin-ARPES in spintronictechnology. All of these new results are made possible due to theSpin-resolved-ARPES (Mott polarimetric) technique[http://www.nature.com/nature/journal/v460/n7259/full/nature08234.html ] .

nature

First observation of Spin-Momentum Helical Locking in Bi2Se3 and Bi2Te3,  demonstration of Topological-Order at 300K and a realization of  topological-transport-regime