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HL: Fachverband Halbleiterphysik

HL 98: Graphene: Spintronics, transistors, and sensors (with DY/MA/O/TT)

HL 98.3: Vortrag

Donnerstag, 3. April 2014, 15:30–15:45, POT 081

Spin-dependent negative differential resistance in composite graphene superlattices — •Christopher Gaul^1,2, 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)