Round 5: 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. These theoretical entities arise in the continuum limit of infinitely many adjacent atomic orbitals. The (-5[1])position of the Fermi level relative to these entities distinguishes conductors from insulators; for insulators, the energy gap between these entities (10[1])is large. For 10 points, (10[1])name these allowed energy levels of semiconductors that include their “conduction” and “valence” types. ■END■ (10[1]0[2])

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