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Doped carbon nanotubes as a model system of biased graphene

Authors/others:Szirmai, Péter (École polytechnique fédérale de Lausanne) Markus, Bence G. (Budapest University of Technology and Economics) Dora, B. (Budapest University of Technology and Economics) Fabian, Gabor (Budapest University of Technology and Economics) Koltai, János (Eötvös Loránd University Budapest) Zolyomi, V. (University of Manchester) Kurti, J. (Eötvös Loránd University Budapest) Nafradi, B. (École polytechnique fédérale de Lausanne) Forro, László (École polytechnique fédérale de Lausanne) Pichler, T.Simon, F. (Budapest University of Technology and Economics)
Abstract:Albeit difficult to access experimentally, the density of states (DOS) is a key parameter in solid-state systems, which governs several important phenomena including transport, magnetism, thermal, and thermoelectric properties. We study DOS in an ensemble of potassium intercalated single-wall carbon nanotubes and show, using electron spin resonance spectroscopy, that a sizable number of electron states are present, which gives rise to a Fermi-liquid behavior in this material. A comparison between theoretical and the experimental DOS indicates that it does not display significant correlation effects, even though the pristine nanotube material shows a Luttinger-liquid behavior. We argue that the carbon nanotube ensemble essentially maps out the whole Brillouin zone of graphene, thus it acts as a model system of biased graphene.
Number of pages:7
Date of publication:15.8.2017
Journal title:Physical Review B
Digital Object Identifier (DOI):https://doi.org/10.1103/PhysRevB.96.075133
Publication Type:Article
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