title: Ultralong dephasing time in InGaAs quantum dots.
abstract: We measure a dephasing time of several hundred picoseconds at low temperature in the ground-state transition of strongly confined InGaAs quantum dots, using a highly sensitive four-wave mixing technique. Between 7 and 100 K the polarization decay has two distinct components resulting in a non-Lorentzian line shape with a lifetime-limited zero-phonon line and a broadband from elastic exciton-acoustic phonon interactions.
authors.affiliation: Experimentelle Physik IIb, Universität Dortmund, Otto-Hahn Strasse 4, D-44221 Dortmund, Germany.
authors.forename: P
authors.initials: P
authors.lastname: Borri
authors.forename: W
authors.initials: W
authors.lastname: Langbein
authors.forename: S
authors.initials: S
authors.lastname: Schneider
authors.forename: U
authors.initials: U
authors.lastname: Woggon
authors.forename: R L
authors.initials: RL
authors.lastname: Sellin
authors.forename: D
authors.initials: D
authors.lastname: Ouyang
authors.forename: D
authors.initials: D
authors.lastname: Bimberg