Experimental evidence of the hyperfine interaction between hole and nuclear spins in InAs/GaAs quantum dots

Benoît Eble (1) , Christophe Testelin (1) , Pascal Desfonds (1) , Frédéric Bernardot (1) , Andrea Balocchi (2) , Thierry Amand , A. Miard (3) , A. Lemaître (3) , Xavier Marie , Maria Chamarro (1)

1 INSP - Institut des Nanosciences de Paris
2 LPCNO - Laboratoire de physique et chimie des nano-objets
3 LPN - Laboratoire de photonique et de nanostructures

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

Mots clés: III-V; spintronic; nanoscale

Domaines: Matière Condensée [cond-mat]

Benoît Eble, Christophe Testelin, Pascal Desfonds, Frédéric Bernardot, Andrea Balocchi, et al.. Experimental evidence of the hyperfine interaction between hole and nuclear spins in InAs/GaAs quantum dots. Novel Materials and Devices for Spintronics, Apr 2009, San Francisco, CA, United States. pp.25-30, ⟨10.1557/PROC-1183-FF05-01⟩. ⟨hal-01229221⟩