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23 April 2024

» arxiv » cond-mat/0506624

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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 ;
Date:	24 Jun 2005
Subject:	Other \| cond-mat.other
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.
Source:	arXiv, cond-mat/0506624
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