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Topological insulators (TIs) and graphene present two unique classes ofmaterials which are characterized by spin polarized (helical) and non-polarizedDirac-cone band structures, respectively. The importance of many-bodyinteractions that renormalize the linear bands near Dirac point in graphene hasbeen well recognized and attracted much recent attention. However,renormalization of the helical Dirac point has not been observed in TIs. Here,we report the experimental observation of the renormalized quasi-particlespectrum with a skewed Dirac cone in a single Bi bilayer grown on Bi2Te3substrate, from angle-resolved photoemission spectroscopy. First-principlesband calculations indicate that the quasi-particle spectra are likelyassociated with the hybridization between the extrinsic substrate-induced Diracstates of Bi bilayer and the intrinsic surface Dirac states of Bi2Te3 film atclose energy proximity. Without such hybridization, only single-particle Diracspectra are observed in a single Bi bilayer grown on Bi2Se3, where theextrinsic Dirac states Bi bilayer and the intrinsic Dirac states of Bi2Se3 arewell separated in energy. The possible origins of many-body interactions arediscussed. Our findings provide a means to manipulate topological surfacestates.

Quasiparticle Dynamics in Reshaped Helical Dirac Cone of Topological Insulators