Dresden 2009 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 26: Transport: Graphene and Carbon Nanotubes

TT 26.3: Talk

Wednesday, March 25, 2009, 14:45–15:00, HSZ 03

Transport properties of the graphene edge state — •Michael Wimmer, Inanc Adagideli, and Klaus Richter — Institut für Theoretische Physik, Universität Regensburg, 93040 Regensburg

A graphene edge in zigzag configuration supports a localized state, the graphene edge state. Despite being localized at the graphene boundary, recent numerical studies within the nearest-neighbor tight-binding model found that transport in the graphene edge state is influenced little by edge defects [1].

We investigate systematically the transport properties of the graphene edge state for corrections to the nearest-neighbor tight-binding model. In particular we find that the nearest-neighbor tight-binding model—the paradigm model of graphene—is not suitable for describing edge state transport, as exponentially small corrections (such as next-nearest neighbor hopping, see also Ref. [2]) alter the transport properties of the edge state fundamentally.

[1] F. Muñoz Rojas et al., Phys. Rev. B 74, 195417 (2006), L. Zârbo et al., Europhys. Lett. 80, 47001 (2007).

[2] M. Wimmer et al., Phys. Rev. Lett. 100, 177207 (2008).