Electric-field and exciton structure in CdSe nanocrystals

摘要: Quantum Stark effect in semiconductor nanocrystals is theoretically investigated, using the effective mass formalism within a $4\ifmmode\times\else\texttimes\fi{}4$ Baldereschi-Lipari Hamiltonian model for hole states. General expressions are reported eigenfunctions at zero electric field. Electron and single-particle energies as functions of field $({\mathbf{E}}_{\mathrm{QD}})$ reported. shift binding energy excitonic levels obtained by full diagonalization correlated electron-hole presence external Particularly, structure lower states their symmetry properties CdSe studied. It found that dependence exciton upon applied strongly reduced small quantum-dot radius. Optical selection rules absorption luminescence obtained. The electric-field induced quenching optical spectra function ${\mathbf{E}}_{\mathrm{QD}}$ studied terms dipole matrix element. predicted photoluminescence present anomalous emission lines. These results agree magnitude with experimental observation main features experiments nanostructures.