Doped carbon nanotubes as a model system of biased graphene
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 (SWCNT) and show using electron spin resonance spectroscopy that a sizeable 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.
Keywords
Cite
@article{arxiv.1608.04938,
title = {Doped carbon nanotubes as a model system of biased graphene},
author = {P. Szirmai and B. G. Márkus and B. Dóra and G. Fábián and J. Koltai and V. Zólyomi and J. Kürti and B. Náfrádi and L. Forró and T. Pichler and F. Simon},
journal= {arXiv preprint arXiv:1608.04938},
year = {2017}
}