title: The role of heavy-light-hole mixing on the optical initialization of hole spin in InAs quantum dots.
abstract: The initialization of a resident hole spin by the absorption of a circularly polarized light at resonance involves the formation of an excited state called a trion state. For a pure heavy hole, this optical initialization is mediated by the hyperfine electron-nuclear coupling in the trion state. We show here that for a mixed-hole spin an additional mechanism for the optical initialization appears, associated to 'crossed transitions'; it becomes dominant and keeps a high level of hole spin polarization when the magnetic field screens the electron-nuclear interaction. Finally, using a simple model, we obtain a good theoretical agreement with pulsed pump-probe experiments.
authors.affiliation: Institut des NanoSciences de Paris, UPMC Université Paris 06, CNRS UMR 7588, 4 place Jussieu, F-75252 Paris Cedex 05, France.
authors.forename: F
authors.initials: F
authors.lastname: Fras
authors.forename: F
authors.initials: F
authors.lastname: Bernardot
authors.forename: B
authors.initials: B
authors.lastname: Eble
authors.forename: M
authors.initials: M
authors.lastname: Bernard
authors.forename: B
authors.initials: B
authors.lastname: Siarry
authors.forename: A
authors.initials: A
authors.lastname: Miard
authors.forename: A
authors.initials: A
authors.lastname: Lemaître
authors.forename: C
authors.initials: C
authors.lastname: Testelin
authors.forename: M
authors.initials: M
authors.lastname: Chamarro