title: Polarized fine structure in the photoluminescence excitation spectrum of a negatively charged quantum dot.
abstract: We report polarized photoluminescence excitation spectroscopy of the negative trion in single charge-tunable quantum dots. The spectrum exhibits a p-shell resonance with polarized fine structure arising from the direct excitation of the electron spin triplet states. The energy splitting arises from the axially symmetric electron-hole exchange interaction. The magnitude and sign of the polarization are understood from the spin character of the triplet states and a small amount of quantum dot asymmetry, which mixes the wave functions through asymmetric e-e and e-h exchange interactions.
authors.affiliation: Naval Research Laboratory, Washington, DC 20375, USA.
authors.forename: M E
authors.initials: ME
authors.lastname: Ware
authors.forename: E A
authors.initials: EA
authors.lastname: Stinaff
authors.forename: D
authors.initials: D
authors.lastname: Gammon
authors.forename: M F
authors.initials: MF
authors.lastname: Doty
authors.forename: A S
authors.initials: AS
authors.lastname: Bracker
authors.forename: D
authors.initials: D
authors.lastname: Gershoni
authors.forename: V L
authors.initials: VL
authors.lastname: Korenev
authors.forename: S C
authors.initials: SC
authors.lastname: Bădescu
authors.forename: Y
authors.initials: Y
authors.lastname: Lyanda-Geller
authors.forename: T L
authors.initials: TL
authors.lastname: Reinecke