Dresden 2014 – scientific programme
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O: Fachverband Oberflächenphysik
O 26: Transport: Graphene (TT jointly with O)
O 26.8: Talk
Tuesday, April 1, 2014, 11:45–12:00, WIL C107
Electric field control of spin-polarized electron transport through zigzag graphene nanosheets — •Dirk Wiedmann1, Marius Bürkle2, and Fabian Pauly1 — 1Department of Physics, University of Konstanz, Germany — 2National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan
We study the spin-polarized transport through a finite zigzag graphene nanoribbon, contacted by carbon-nanotube electrodes [1]. The electronic structure is determined from density functional theory, and Green’s functions are used to compute the phase-coherent electric current within the Landauer scattering theory. We observe antiferromagnetically coupled edge states in the graphene nanosheet, which may lead to spin-polarized currents. We analyze how they depend on the position of the electrodes and on applied transverse electric fields. Our ab-initio results are rationalized with the help of a Hubbard model.
D. Wiedmann, M. Bürkle, and F. Pauly, in preparation.