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(a) Scheme of a Dirac cone at the surface of a Topological Insulator (TI) showing the spin-momentum locking (spin orientations are indicated by red arrows). (b) Angle-Resolved Photoemission Spectroscopy (ARPES) image of the band structure showing the Dirac cone at the center of the Brillouin zone. Reprinted with permission from Reference [7]. Copyright 2010 American Physical Society.
