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 ...

Figure 1: Electronic band structure of twisted bilayer graphene (TBG). Figure 2: Half-filling insulating states in magic-angle TBG. Figure 4: Magnetic-field response of the half-filling insulating ...

Topological materials are a class of materials that exhibit unique electronic properties at their boundary (surface in 3D materials; edge in 2D materials) that are robust against imperfections or ...