Dresden 2009 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

MA: Fachverband Magnetismus

MA 40: Poster II: Bio- and Molecular Magnetism (1-9); Magnetic Coupling Phenomena/Exchange Bias (10-15); Magnetic Particlicles and Clusters (16-29); Micro and Nanostructured Magnetic Materials (30-51); Multiferroics (52-64); Spin Injection in Heterostructures (65-67); Spin-Dyn./Spin-Torque (68-93); Spindependent Transport (94-108)

MA 40.66: Poster

Freitag, 27. März 2009, 11:00–14:00, P1A

Magnetic and nonmagnetic states in graphene — •Zhen Gang Zhu¹, Kai He Ding², and Jamal Berakdar¹ — ¹Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, Nanotechnikum-Weinberg, Heinrich-Damerow-Strasse 4, D-06120 Halle (Saale), Germany — ²Department of Physics and Electronic Science, Changsha University of Science and Technology, Changsha 410076, People's Republic of China

We investigate the conditions necessary for the presence or absence of localized magnetic moments on adatoms in graphene by using the equation of motion method for the Green's function. After decoupling to the third order, a self-consistent integral equation can be obtained. Its analytical properties are discussed. A compact analytical solution for the Green*s function is derived from the integral equations in the infinite interaction limit, giving rise to a set of self-consistent equations for the occupation numbers with different spins. Magnetic and nonmagnetic states of the impurity are discussed accordingly.