Anisotropic behavior of quantum transport in graphene superlattices : coexistence of ballistic conduction with Anderson insulating regime
Pedersen, Jesper Goor (Institut Català de Nanociència i Nanotecnologia)
Cummings, Aron (Institut Català de Nanociència i Nanotecnologia)
Roche, Stephan (Institut Català de Nanociència i Nanotecnologia)

Data:	2014
Resum:	We report on the possibility to generate highly anisotropic quantum conductivity in disordered graphene-based superlattices. Our quantum simulations, based on an efficient real-space implementation of the Kubo-Greenwood formula, show that in disordered graphene superlattices the strength of multiple scattering phenomena can strongly depend on the transport measurement geometry. This eventually yields the coexistence of a ballistic waveguide and a highly resistive channel (Anderson insulator) in the same two-dimensional platform, evidenced by a σyy/σxx ratio varying over several orders of magnitude, and suggesting the possibility of building graphene electronic circuits based on the unique properties of chiral massless Dirac fermions in graphene.
Ajuts:	European Commission 604391 Ministerio de Economía y Competitividad MAT2012-33911
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Publicat a:	Physical review B : Condensed matter and materials physics, Vol. 89, issue 16 (April 2014) , art. 165401, ISSN 1550-235X

DOI: 10.1103/PhysRevB.89.165401

Postprint 7 p, 981.7 KB

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