Round 2: Tossup 15

If the transfer integral of these particles is small, the repulsion between them can lead to the Mott transition. (10[1])If these particles are “nearly free” but weakly interact with a periodic potential, Bloch’s theorem can be used to compute their band structure. Superconductivity is caused by bound pairs (10[1])of (10[1])these particles (10[1])theorized by Leon Cooper. Places in a lattice where these particles don’t exist are called holes. (10[1])If a photon’s (10[1])energy exceeds a material’s work function, it can eject one of these particles (10[1])in an effect whose description won Albert Einstein the Nobel Prize. (-5[1])For 10 points, name these negatively-charged (10[1])particles whose orbitals surround the (10[1])nuclei of atoms. ■END■

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