title: Spin excitations of the spin-polarized electron gas in semimagnetic quantum wells.
abstract: Collective and single-particle spin-flip excitations of a two-dimensional electron gas in a semimagnetic Cd(1-x)Mn(x)Te quantum well are observed by resonant Raman scattering. Application of a magnetic field splits the spin subbands and a spin polarization is induced in the electron gas. Above 1 T the collective modes, which disperse with the in-plane wave vector, dominate the spectra. The local spin-density approximation provides a good description of our results and enables us to confirm that the energy of the low wave vector collective mode is given by the bare Zeeman energy.
authors.affiliation: CNRS/LPN, Route de Nozay, 91460 Marcoussis, France.
authors.forename: B
authors.initials: B
authors.lastname: Jusserand
authors.forename: F
authors.initials: F
authors.lastname: Perez
authors.forename: D R
authors.initials: DR
authors.lastname: Richards
authors.forename: G
authors.initials: G
authors.lastname: Karczewski
authors.forename: T
authors.initials: T
authors.lastname: Wojtowicz
authors.forename: C
authors.initials: C
authors.lastname: Testelin
authors.forename: D
authors.initials: D
authors.lastname: Wolverson
authors.forename: J J
authors.initials: JJ
authors.lastname: Davies