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Quantum transport in chemically functionalized graphene at high magnetic field: defect-induced critical states and breakdown of electron-hole symmetry

AutorLeconte, Nicolás; Ortmann, F. ; Cresti, A.; Charlier, Jean-Christopher; Roche, Stephan
Palabras claveQuantum hHall effect
Critical states
Fecha de publicación2014
EditorInstitute of Physics Publishing
Citación2D Materials 1(2): 021001 (2014)
ResumenUnconventional 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 low-energy, 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.
Versión del editorhttp://dx.doi.org/10.1088/2053-1583/1/2/021001
Identificadoresdoi: 10.1088/2053-1583/1/2/021001
e-issn: 2053-1583
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