Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 46: Graphene: Spintronics, transistors, and sensors (with DY/DS/HL/O/TT)
MA 46.3: Vortrag
Donnerstag, 3. April 2014, 15:30–15:45, POT 081
Spin-dependent negative differential resistance in composite graphene superlattices — •Christopher Gaul1,2, Javier Munárriz2, Andrey V Malyshev2, Pedro A Orellana3, Cord A Müller4, and Francisco Domínguez-Adame2 — 1Max-Planck-Institut für Physik Komplexer Systeme, Dresden — 2Universidad Complutense de Madrid, Spain — 3Universidad Técnica Federico Santa María, Casilla 110 V, Valparaíso, Chile — 4Fachbereich Physik, Universität Konstanz
We propose and study a compound system of a graphene nanoribbon and a set of ferromagnetic insulator strips deposited on top of it. The periodic array of ferromagnetic strips induces a proximity exchange splitting of the electronic states in graphene, resulting in the appearance of a superlattice with a spin-dependent energy spectrum. We find clear signatures of spin-dependent negative differential resistance. The electric current through the device can be highly polarized and both the current and its polarization manifest non-monotonic dependence on the bias voltage. The device operates therefore as an Esaki spin diode, which opens possibilities to design new spintronic circuits.
Phys. Rev. B 88, 155423 (2013)