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A topological insulator is characterized by spin-momentum locking on itsboundary. The spin momentum locking on the surface of a three dimensionaltopological insulator leads to the existence of a non-trivial Berry's phasewhich leads to exotic transport phenomena on topological surfaces. Usingspin-sensitive probes (Mott polarimetry), we observe the spin-momentum couplingand uncover the chiral nature of surface electrons in TlBiSe2. We demonstratethat the surface electrons in TlBiSe2 collectively carry a quantum Berry'sphase of $\pi$ and a definite chirality ($\eta$ = -1, left-handed) associatedwith its spin-texture or vortex-structure on the Fermi surface on both the topand the bottom surfaces. Our experimental results for the first time not onlyprove the existence of Z2 topological-order in the bulk but also reveal theexistence of helical quasiparticle modes on the topological surface.Spin-texture calculations would be reported elsewhere.

Observation of Topological Order in the TlBiSe2 class : Probing the "spin" and "phase" on topological insulator surfaces