Packet E: 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 (10[1])interfaces form non-smooth (10[1])Dirac arcs, circles, nodes, or cones. (10[1])In the tight-binding formalism, (-5[1])these structures are computed using a generalization (10[1])of LCAO. (-5[6])These (-5[2])theoretical (-5[2])entities (-5[1])arise (-5[2])in the (-5[1])continuum limit of infinitely many (10[1])adjacent atomic orbitals. (-5[2])The (-5[1])position (-5[1])of the (10[1])Fermi level (10[3])relative (10[1])to these entities (10[2]-5[1])distinguishes conductors from (10[1])insulators; (10[6])for (10[1])insulators, (10[2])the energy gap (10[1])between (10[1])these (10[1])entities (10[5])is large. (10[5]-5[1])For (-5[1])10 points, (10[2])name these (-5[1])allowed energy levels (10[2])of semiconductors (10[2])that include (10[1])their “conduction” and “valence” types. (10[4])■END■ (10[15]0[15])

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