Round 3: Tossup 1

A quantity describing these entities scales with one over width for zigzag nanostructures and one over width squared for armchair nanostructures. The K-points of the Brillouin (“bree-WANN”) zones of TMDCs host the edges of these entities. These entities exhibit linearly dispersing Dirac spectra when their interfaces form non-smooth Dirac arcs, circles, nodes, or cones. In the tight-binding formalism, these structures are computed using a generalization of LCAO. (-5[1])These theoretical entities arise in the continuum limit of infinitely many adjacent atomic orbitals. The position of the Fermi level relative to these entities distinguishes conductors from insulators; for insulators, the energy gap between these entities is large. (10[1])For 10 points, name these (-5[1])allowed energy levels of semiconductors that include their “conduction” and “valence” types. ■END■ (10[3])

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