Optical alignment and polarization conversion of neutral exciton spin in individual InAs/GaAs quantum dots

K. Kowalik; O. Krebs; A. Lemaître; J. A. Gaj; P. Voisin

doi:10.1103/PhysRevB.77.161305

Optical alignment and polarization conversion of neutral exciton spin in individual InAs/GaAs quantum dots

Materials Science 2009-11-13 v1

Authors: K. Kowalik , O. Krebs , A. Lemaître , J. A. Gaj , P. Voisin

View on arXiv ↗ PDF ↗ DOI ↗

Abstract

We investigate exciton spin memory in individual InAs/GaAs self-assembled quantum dots via optical alignment and conversion of exciton polarization in a magnetic field. Quasiresonant phonon-assisted excitation is successfully employed to define the initial spin polarization of neutral excitons. The conservation of the linear polarization generated along the bright exciton eigenaxes of up to 90% and the conversion from circular- to linear polarization of up to 47% both demonstrate a very long spin relaxation time with respect to the radiative lifetime. Results are quantitatively compared with a model of pseudo-spin 1/2 including heavy-to-light hole mixing.

Keywords

exciton spin memory InAs/GaAs quantum dots optical alignment polarization conversion spin relaxation time heavy-to-light hole mixing pseudo-spin 1/2

Cite

@article{arxiv.0801.0571,
  title  = {Optical alignment and polarization conversion of neutral exciton spin in individual InAs/GaAs quantum dots},
  author = {K. Kowalik and O. Krebs and A. Lemaître and J. A. Gaj and P. Voisin},
  journal= {arXiv preprint arXiv:0801.0571},
  year   = {2009}
}

Comments

5 pages, 3 figures

Optical alignment and polarization conversion of neutral exciton spin in individual InAs/GaAs quantum dots

Abstract

Keywords

Cite

Comments

Related papers