Role of hyperfine interaction on electron spin optical orientation in charge-controlled InAs-GaAs single quantum dots

O. Krebs (1) , Benoît Eble (2) , A. Lemaitre (1) , B. Urbaszek , K. Kowalik , A. Kudelski , Xavier Marie (3) , Thierry Amand (4) , P. Voisin (5)

1 LPN - Laboratoire de photonique et de nanostructures
2 INSP - Institut des Nanosciences de Paris
3 LNMO - Laboratoire de Nanophysique Magnétisme et Optoélectronique
4 LPCNO - Laboratoire de physique et chimie des nano-objets
5 LTM - Laboratoire des technologies de la microélectronique

We report on electron spin physics in a single charge-tunable self-assembled InAs/GaAs quantum dot. The hyperfine interaction between the optically oriented electron and nuclear spins leads to the polarization of the quantum dot nuclei. The sign of the resulting Overhauser-shift depends on the trion state X+ or X, and remarkably its strength does not vanish in zero magnetic field. This explains the quenching of X+ spin relaxation under steady-state excitation polarization. (c) 2007 WILEYNCH Verlag GmbH & Co. KGaA, Weinheim.

Domaines: Matière Condensée [cond-mat]

O. Krebs, Benoît Eble, A. Lemaitre, B. Urbaszek, K. Kowalik, et al.. Role of hyperfine interaction on electron spin optical orientation in charge-controlled InAs-GaAs single quantum dots. physica status solidi (a), 2007, 204 (1), pp.202-207. ⟨10.1002/pssa.200673027⟩. ⟨hal-01287887⟩