Hole-Nuclear Spin Interaction in Quantum Dots

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

We have measured the carrier spin dynamics in p-doped InAs/GaAs quantum dots by pump-probe and time-resolved photoluminescence experiments. We obtained experimental evidence of the hyperfine interaction between hole and nuclear spins. In the absence of an external magnetic field, our calculations based on dipole-dipole coupling between the hole and the quantum dot nuclei lead to a hole-spin dephasing time for an ensemble of dots of 14 ns, in close agreement with experiments.

Domaines: Matière Condensée [cond-mat]

Benoît Eble, Christophe Testelin, Pascal Desfonds, Frédéric Bernardot, Andrea Balocchi, et al.. Hole-Nuclear Spin Interaction in Quantum Dots. Physical Review Letters, 2009, 102 (14), ⟨10.1103/PhysRevLett.102.146601⟩. ⟨hal-01229240⟩