Fine structure of the trion triplet state in a single self-assembled semiconductor quantum dot

Akimov, I. A.; Hundt, A.; Flissikowski, T.; Henneberger, F.
December 2002
Applied Physics Letters;12/16/2002, Vol. 81 Issue 25, p4730
Academic Journal
The emission from the charged biexciton is used to monitor the energy structure of the trion triplet state in a negatively charged CdSe/ZnSe quantum dot. The isotropic part of the electron-hole exchange interaction regroups the otherwise sixfold degenerated state in three Kramers doublets. The energy separation between the radiative pairs with total spin projection F[sub z] = ±3/2 and ±1/2 is 1.6 meV. The anisotropic part mixes states with δF[sub z] = ±2 resulting in a partly linearly polarized transition dipole. Application of magnetic field lifts the degeneracy of the Kramers doublets. The g factors also manifest the anisotropic state mixing.


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