Doped carbon nanotubes as a model system of biased graphene

P. Szirmai, B. G. Márkus, B. Dóra, G. Fábián, J. Koltai, V. Zólyomi, J. Kürti, B. Náfrádi, L. Forró, T. Pichler, F. Simon

Research output: Contribution to journalArticle

2 Citations (Scopus)

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.

Original languageEnglish
Article number075133
JournalPhysical Review B
Volume96
Issue number7
DOIs
Publication statusPublished - Aug 15 2017

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Szirmai, P., Márkus, B. G., Dóra, B., Fábián, G., Koltai, J., Zólyomi, V., Kürti, J., Náfrádi, B., Forró, L., Pichler, T., & Simon, F. (2017). Doped carbon nanotubes as a model system of biased graphene. Physical Review B, 96(7), [075133]. https://doi.org/10.1103/PhysRevB.96.075133