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

Authors

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

Published in:

Physical Review Letters 95,17 (2005) 177403;

Link to original published article:

http://dx.doi.org/10.1103/PhysRevLett.95.177403

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 wave functions through asymmetric e-e and e-h exchange interactions.

Keywords

relaxation;; trion

Date of this Version

January 2005