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

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

2005-06-23

arxiv.org/abs/cond-mat/0506624v1

Phys. Rev. Lett. 95 (2005) 177403

Physics

Condensed Matter

Other Condensed Matter

Scientific paper

10.1103/PhysRevLett.95.177403

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.

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