title: Electrical control of hole spin relaxation in charge tunable InAs/GaAs quantum dots.
abstract: We report on optical orientation of singly charged excitons (trions) in charge-tunable self-assembled InAs/GaAs quantum dots. When the charge varies from 0 to -2, the trion photoluminescence of a single quantum dot shows up and under quasiresonant excitation gets progressively polarized from zero to approximately 100%. This behavior is interpreted as the electric control of the trion thermalization process, which subsequently acts on the hole-spin relaxation driven in nanosecond time scale by the anisotropic electron-hole exchange. This is supported by the excitation spectroscopy and time-resolved measurements of a quantum dot ensemble.
authors.affiliation: CNRS-Laboratoire de Photonique et Nanostructures, Route de Nozay, 91460 Marcoussis, France.
authors.forename: S
authors.initials: S
authors.lastname: Laurent
authors.forename: B
authors.initials: B
authors.lastname: Eble
authors.forename: O
authors.initials: O
authors.lastname: Krebs
authors.forename: A
authors.initials: A
authors.lastname: Lemaître
authors.forename: B
authors.initials: B
authors.lastname: Urbaszek
authors.forename: X
authors.initials: X
authors.lastname: Marie
authors.forename: T
authors.initials: T
authors.lastname: Amand
authors.forename: P
authors.initials: P
authors.lastname: Voisin