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Polarons and Excitons
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absorption alloy amplitude APPENDIX approximation assume atom average Bloch Bloch waves Boltzmann equation calculation centre Chapter character table conduction band consider contribution corresponding Coulomb crystal cubic defect defined degeneracy density matrix derived diagonal discussed displaced charge double groups effective mass electron-phonon equilibrium excited exciton Fermi level Fermi surface follows Fourier transform free electrons frequency given Green function Hamiltonian Hence integral interaction irreducible representations lattice vectors linear magnetic field matrix element metal method modes momentum obtain operator optical orbit oscillations perfect lattice perturbation phase phonon Phys plane point group polarization polaron problem relation resonance result right-hand side rotation scattering screening semi-conductors shown in Figure simply solid solution spectrum spherical spin structure superconductor symmetry temperature theory thermal time-reversal transition unperturbed velocity Wannier Wannier function wave function write zero