Journal
PHYSICAL REVIEW B
Volume 80, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.201403
Keywords
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Funding
- Stichting voor Fundamenteel Onderzoek der Materie (FOM)
- Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)
- EuroMagNET [RII3-CT-2004-506239]
- EPSRC-GB
- Royal Society and the European Research Council (Program Ideas, [ERC2007-StG]
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We have measured a strong increase of the low-temperature resistivity rho(xx) and a zero-value plateau in the Hall conductivity sigma(xy) at the charge neutrality point in graphene subjected to high magnetic fields up to 30 T. We explain our results by a simple model involving a field dependent splitting of the lowest Landau level of the order of a few Kelvin, as extracted from activated transport measurements. The model reproduces both the increase in rho(xx) and the anomalous nu = 0 plateau in sigma(xy) in terms of coexisting electrons and holes in the same split zero-energy Landau level.
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