Polarized fine structure in the excitation spectrum of a negatively charged quantum dot

Abstract

We report polarized photoluminescence excitation spectroscopy of the negative trion in single charge tunable InAs/GaAs quantum dots. The spectrum exhibits a p-shell resonance with polarized fine structure arising from the direct excitation of the electron spin triplet states. The energy splitting arises from the axially symmetric electron-hole exchange interaction. The magnitude and sign of the polarization are understood from the spin character of the triplet states and a small amount of quantum dot asymmetry, which mixes the wavefunctions through asymmetric e-e and e-h exchange interactions.

References in corpus (3)

• Spin relaxation in semiconductor quantum dots
• Optical pumping of electronic and nuclear spin in single charge-tunable quantum dots
• Symmetry of anisotropic exchange interactions in semiconductor nanostructures

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