Dresden 2009 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 9: Poster 1
HL 9.11: Poster
Montag, 23. März 2009, 14:30–17:00, P2
Indirect exchange interaction in graphene — •Józef Barnaś1,2, Vitalii Dugaev3,4, Paweł Małyszek1, and Volodya Litvinov5 — 1Department of Physics, Adam Mickiewicz University, 61-614 Poznań, Poland — 2Institute of Molecular Physics, PAN, 60-179 Poznań, Poland — 3Department of Physics, Rzeszów University of Technology, 35-959 Rzeszów, Poland — 4Department of Physics and CFIF, Instituto Superior Técnico, 1049-001 Lisbon, Portugal — 5Waveband/Sierra Nevada Corporation, Irvine, CA 92618, USA
We have analyzed the problem of magnetic correlations, indirect exchange interaction of magnetic impurities, and magnetic Friedel oscillations in graphene, mostly concentrating on the possible effects of spin-orbit interactions. The spin-orbit interaction produces a gap, which makes the correlation functions less long-ranged. Two kinds of spin-orbit interaction are taken into account: intrinsic spin-orbit coupling which inherently exists in graphene plane, and Rashba spin-orbit interaction due to asymmetry between bottom and top surfaces. Using the relativistic model of Dirac, we have calculated the magnetic polarization profile with Friedel oscillations effectively damped by the spin-orbit interaction. The interaction between magnetic impurities may lead to ferromagnetic ordering. The effective coupling constant is shown to depend on the location of magnetic impurities in the graphene sublattices.