Coulomb correlations of charged excitons in semiconductor quantum dots

The emission pattern of charged excitons in a semiconductor quantum dot (QD) is composed of a quadruplet of linearly polarized lines when a magnetic field is applied in a Voigt configuration. The orientation of the linear polarization of exciton emission is controlled by the orientation of the magnetic field in QDs with C-3v symmetry while for QDs with C-2v symmetry it is not. We demonstrate that the g factor of holes is very sensitive to the dot shape asymmetry but that of electrons is not. By comparing the effective g factors obtained for the neutral and charged excitons in the same quantum dot, we uncover the role of Coulomb correlations in these excitonic states. We show that the C-3v symmetry of pyramidal QDs makes them ideal candidates for implementing all-optical many-qubits gates based on electron spin as a quantum bit.

Published in:
Physical Review B, 80, 165312-(1-7)

Note: The status of this file is: EPFL only

 Record created 2010-03-26, last modified 2018-03-17

Fig1c-bis.qpc - Download fulltextQPC
Fig65.qpc - Download fulltextQPC
Fig4b.qpc - Download fulltextQPC
Fig3d-bis.qpc - Download fulltextQPC
Fig00.qpc - Download fulltextQPC
Fig3c.qpc - Download fulltextQPC
Fig2b-bis.qpc - Download fulltextQPC
Fig2a-bis.qpc - Download fulltextQPC
Fig4a.qpc - Download fulltextQPC
Publisher's version:
Download fulltextPDF
Fig2-bis - Download fulltextPDF
Fig1-bis - Download fulltextPDF
Fig4-new - Download fulltextPDF
Fig3-new - Download fulltextPDF
Rate this document:

Rate this document:
(Not yet reviewed)