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TT: Fachverband Tiefe Temperaturen

TT 42: Transport: Graphene (organized by TT)

TT 42.8: Vortrag

Dienstag, 1. April 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.