| Summary: | 碩士 === 國立交通大學 === 電子物理系所 === 98 === The fine structure splitting (FSS) and polarization anisotropy (PA) of exciton emissions from single InAs/GaAs quantum dots (QDs) are investigated. A systematic correlation between the FSS and PA is observed. The excitonic FSS is attributed to the QD shape asymmetry reduction, while the PA is a direct consequence of the mixing between the heavy-hole (hh) and light-hole (lh) states due to the anisotropy in-plane strain distribution. Based on the formulism of the Bir-Pikus Hamiltonian, the interplay between the FSS, the hh-lh mixing, as well as the PA are discussed. An in-plane magnetic field is used to manipulate the excitonic FSS in QDs. We find that, for QDs with negative FSS, the degeneracy of the exciton states can be recovered under an in-plane magnetic field.
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