  Topological insulator is a new state of matter which exhibits exotic surface
electronic properties. Determining the spin texture of this class of material
is of paramount importance for understanding its topological order and can lead
to potential applications in spintronics. Here, we have investigated the nature
of the surface state of the topological insulator with hexagonal warping
subjected to an off-resonant circularly polarized light. The resulting
electronic ground state exhibits a novel feature of spin texture breaking the
conventional spin-momentum locking present on a topological insulator surface.
The observed spin texture is shown to be a consequence of the symmetry group of
the underlying crystal. The generalisation of our method to the other 2D
graphene-like systems are straightforward. Our calculation charts a simple
experimental route for a realisation of the non-trivial spin-textures.
