title: Griffiths phase in diluted magnetic semiconductors.
abstract: We study the effects of disorder in the vicinity of the ferromagnetic transition in a diluted magnetic semiconductor in the strongly localized regime. We derive an effective polaron Hamiltonian, which leads to the Griffiths phase above the ferromagnetic transition point. The Griffiths-McCoy effects yield nonperturbative contributions to the dynamic susceptibility. We explicitly derive the long-time susceptibility, which has a pseudoscaling form, with the dynamic critical exponent being expressed through the percolation indices.
authors.affiliation: Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park, MD 20742-4111, USA.
authors.forename: V M
authors.initials: VM
authors.lastname: Galitski
authors.forename: A
authors.initials: A
authors.lastname: Kaminski
authors.forename: S
authors.initials: S
authors.lastname: Das Sarma