Low-energy excitations of neutral C60.

摘要: Low-energy excited states of a neutral ${\mathrm{C}}_{60}$ molecule are studied in detail. The system is described by Su-Schrieffer-Heeger Hubbard-type Hamiltonian which solved perturbatively the electron-electron interactions. optical-absorption spectrum computed including both direct and one-phonon-induced processes. Electronic-correlation effects qualitatively important and, if only interaction taken to be large enough, good agreement with experiments achieved. Furthermore, it shown that, this model, lowest-energy spin-triplet state stable against decay due Coulomb binding. Also, theory predicts triplet-triplet band about at 0.45 eV which, my knowledge, has not yet been observed experimentally.