Contact: Paul Preuss
DOE/Lawrence Berkeley National Laboratory
Caption: ARPES maps the electronic properties, including the band structure and Fermi surface, of the topological insulator bismuth selenide (left). Like graphene, the lower energy valence band of a topological insulator meets the higher energy conduction band at a point, the Dirac point, with no gap between the bands (center). Unlike graphene, however, the Fermi surface does not usually pass through the Dirac point. Distinct spin states (red arrows) are associated with each different orientation in momentum space (right).
Credit: Lawrence Berkeley National Laboratory
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