Charge and spin transport anisotropy in nanopatterned graphene
Gregersen, Søren Schou (Danmarks Tekniske Universitet. Center for Nanostructured Graphene)
Garcia, José H. (Institut Català de Nanociència i Nanotecnologia)
Jauho, Antti-Pekka (Danmarks Tekniske Universitet. Center for Nanostructured Graphene)
Roche, Stephan (Institut Català de Nanociència i Nanotecnologia)
Power, Stephen R. (Institut Català de Nanociència i Nanotecnologia)

Date:	2018
Abstract:	Anisotropic electronic transport is a possible route towards nanoscale circuitry design, particularly in two-dimensional materials. Proposals to introduce such a feature in patterned graphene have to date relied on large-scale structural inhomogeneities. Here we theoretically explore how a random, yet homogeneous, distribution of zigzag-edged triangular perforations can generate spatial anisotropies in both charge and spin transport. Anisotropic electronic transport is found to persist under considerable disordering of the perforation edges, suggesting its viability under realistic experimental conditions. Furthermore, controlling the relative orientation of perforations enables spin filtering of the transmitted electrons, resulting in a half-metallic anisotropic transport regime. Our findings point towards a co-integration of charge and spin control in a two-dimensional platform of relevance for nanocircuit design. We further highlight how geometrical effects allow finite samples to display finite transverse resistances, reminiscent of Spin Hall effects, in the absence of any bulk fingerprints of such mechanisms, and explore the underlying symmetries behind this behaviour.
Grants:	European Commission 665919 Ministerio de Economía y Competitividad FIS2015-67767-P Ministerio de Economía y Competitividad FIS2015-64886-C5-3-P European Commission 785219 Ministerio de Economía y Competitividad SEV-2013-0295
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Graphene ; Zigzag edge magnetism ; Antidots ; Perforations ; Spin splitting ; Anisotropic transport ; Spintronics
Published in:	JPhys materials, Vol. 1, Núm. 1 (September 2018) , art. 015005, ISSN 2515-7639

DOI: 10.1088/2515-7639/aadca3

13 p, 895.2 KB

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles