Doped carbon nanotubes as a model system of biased graphene

Author(s)
Péter Szirmai, Bence G. Markus, B. Dora, Gabor Fabian, János Koltai, V. Zolyomi, J. Kurti, B. Nafradi, László Forro, T. Pichler, F. Simon
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.

Organisation(s)
Electronic Properties of Materials
External organisation(s)
Budapest University of Technology and Economics, Eötvös Loránd University Budapest, University of Manchester, École polytechnique fédérale de Lausanne
Journal
Physical Review B
Volume
96
No. of pages
7
ISSN
2469-9950
DOI
https://doi.org/10.1103/PhysRevB.96.075133
Publication date
08-2017
Peer reviewed
Yes
Austrian Fields of Science 2012
103020 Surface physics, 103018 Materials physics, 103009 Solid state physics
Keywords
ASJC Scopus subject areas
Electronic, Optical and Magnetic Materials, Condensed Matter Physics
Portal url
https://ucris.univie.ac.at/portal/en/publications/doped-carbon-nanotubes-as-a-model-system-of-biased-graphene(fdcf28a6-445f-44ad-99cf-0ec80f2a1973).html