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

M. E. Ware·E. A. Stinaff·D. Gammon·M. F. Doty·A. S. Bracker·D. Gershoni·V. L. Korenev·S. C. Badescu·Y. Lyanda-Geller·T. L. Reinecke
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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.

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M. E. Ware, E. A. Stinaff, D. Gammon, M. F. Doty, A. S. Bracker, D. Gershoni, V. L. Korenev, S. C. Badescu, Y. Lyanda-Geller, T. L. Reinecke. 2005-06-23. Polarized fine structure in the excitation spectrum of a negatively charged quantum dot. https://doi.org/10.1103/physrevlett.95.177403

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