Experimental evidence of the hyperfine interaction between hole and nuclear spins in InAs/GaAs quantum dots
Résumé
The spin dynamics of resident holes in singly p doped InAs/GaAs quantum dots is studied by pump probe photo-induced circular dichroism experiments We show that the hole spin dephasing is controlled by the hyperfine interaction between the hole spin and nuclear spins We find a characteristic hole spin dephasing time of 12 ns, in close agreement with our calculations based on a dipole-dipole coupling between the hole and the quantum dot nuclei Finally we demonstrate that a small external magnetic field typically 10 mT quenches the hyperfine hole spin dephasing