Round 6: 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. (-5[1])These entities exhibit linearly dispersing Dirac spectra when their interfaces form non-smooth (10[1])Dirac arcs, circles, nodes, or cones. In the tight-binding formalism, (-5[1])these structures are computed using a generalization of LCAO. (-5[2])These theoretical (-5[1])entities arise in the continuum limit of infinitely many adjacent atomic orbitals. The position of the Fermi level (10[1])relative (10[1])to these entities distinguishes conductors from insulators; (10[1])for insulators, (10[2])the energy gap between these entities (10[1])is large. (10[1])For 10 points, name these allowed energy levels of semiconductors that include their “conduction” and “valence” types. (10[1])■END■ (10[2]0[1])

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