Quantum transport in chemically functionalized graphene at high magnetic field : Defect-induced critical states and breakdown of electron-hole symmetry
Leconte, Nicolas (Institut Català de Nanociència i Nanotecnologia)
Ortmann, Frank (Institut Català de Nanociència i Nanotecnologia)
Cresti, Alessandro (Université Grenoble Alpes)
Charlier, Jean Christophe (Université Catholique de Louvain. Institute of Condensed Matter and Nanosciences)
Roche, Stephan (Institut Català de Nanociència i Nanotecnologia)

Date:	2014
Abstract:	Unconventional magnetotransport fingerprints in the quantum Hall regime (with applied magnetic fields from one to several tens of Tesla) in chemically functionalized graphene are reported. Upon chemical adsorption of monoatomic oxygen (from 0. 5% to few percents), the electron-hole symmetry of Landau levels (LLs) is broken, while a double-peaked conductivity develops at lowenergy, resulting from the formation of critical states conveyed by the random network of defects-induced impurity states. Scaling analysis hints towards the existence of an additional zero-energy quantized Hall conductance plateau, which is here not connected to degeneracy lifting of LLs by sublattice symmetry breaking. This singularly contrasts with usual interpretation, and unveils a new playground for tailoring the fundamental characteristics of the quantum Hall effect.
Grants:	Ministerio de Economía y Competitividad MAT2012-33911
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Published in:	2D materials, Vol. 1, Núm. 2 (September 2014) , art. 21001, ISSN 2053-1583

DOI: 10.1088/2053-1583/1/2/021001

Postprint 8 p, 505.6 KB

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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