title: Optical control of spin coherence in singly charged (In,Ga)As/GaAs quantum dots.
abstract: Electron spin coherence has been generated optically in n-type modulation doped (In,Ga)As/GaAs quantum dots (QDs) which contain on average a single electron per dot. The coherence arises from resonant excitation of the QDs by circularly polarized laser pulses, creating a coherent superposition of an electron and a trion. Time dependent Faraday rotation is used to probe the spin precession of the optically oriented electrons about a transverse magnetic field. The coherence generation can be controlled by pulse intensity, being most efficient for (2n+1)pi pulses.
authors.affiliation: Experimentelle Physik II, Universität Dortmund, D-44221 Dortmund, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Greilich
authors.forename: R
authors.initials: R
authors.lastname: Oulton
authors.forename: E A
authors.initials: EA
authors.lastname: Zhukov
authors.forename: I A
authors.initials: IA
authors.lastname: Yugova
authors.forename: D R
authors.initials: DR
authors.lastname: Yakovlev
authors.forename: M
authors.initials: M
authors.lastname: Bayer
authors.forename: A
authors.initials: A
authors.lastname: Shabaev
authors.forename: Al L
authors.initials: AL
authors.lastname: Efros
authors.forename: I A
authors.initials: IA
authors.lastname: Merkulov
authors.forename: V
authors.initials: V
authors.lastname: Stavarache
authors.forename: D
authors.initials: D
authors.lastname: Reuter
authors.forename: A
authors.initials: A
authors.lastname: Wieck