Abstract
The energy spectrum fine structure of triplet two-electron states in nanostructures isinvestigated theoretically. Spin–orbit interaction-induced terms in the effective Hamiltonianof the electron–electron interaction are derived for zinc blende lattice semiconductorsystems: quantum wells and quantum dots. The effects of bulk and structural inversionasymmetry are taken into account. Simple analytical expressions describing the splittings ofthe two-electron states localized in a single quantum dot and in a lateral doublequantum dot are derived. The spin degeneracy of triplet states is shown to becompletely lifted by the spin–orbit interaction. An interplay of the conduction bandspin splitting and the spin–orbit terms in the electron–electron interaction isdiscussed. The emission spectra of hot trions and of doubly charged excitonsare calculated and are shown to reveal the fine structure of two-electron states.
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