title: Theory of photo-magnetization of an interacting particle system: application to Hg(1-x)Mn(x)Te.
abstract: We derive a theory of light-induced magnetization of an interacting particle system, which describes a model diluted magnetic semiconductor. We set up a many-body Hamiltonian that includes electron and hole kinetic energies, carrier-photon and carrier-local-moment interactions and all the Coulomb interactions. Using Heisenberg equations of motion and a mean-field approximation, we derive expressions for the carrier spin density and excitonic amplitudes. Non-equilibrium relaxation is included phenomenologically. The interdependence of carrier spin density and the local-moment magnetization is calculated self-consistently. We apply our theory of photo-magnetization to Hg(1-x)Mn(x)Te, choosing parameters of the model appropriate to this system. Our results for the photo-magnetization versus the input laser power agree qualitatively with the observed trends in this system. We also study the photo-magnetization as a function of temperature, manganese concentration and photon energy and the results obtained are along expected lines.
authors.affiliation: Department of Physics, Berhampur University, Berhampur 760007, Orissa, India.
authors.forename: G S
authors.initials: GS
authors.lastname: Tripathi
authors.forename: B G
authors.initials: BG
authors.lastname: Mahanty
authors.forename: P
authors.initials: P
authors.lastname: Tripathi
authors.forename: S N
authors.initials: SN
authors.lastname: Behera