We report the synthesis of a novel isotope engineered 13C--12C heteronuclear nanostructure: single-wall carbon nanotubes made of 13C enriched clusters which are embedded in natural carbon regions. The material is synthesized with a high temperature annealing from 13C enriched benzene and natural C60, which are co-encapsulated inside host SWCNTs in an alternating fashion. The Raman 2D line indicates that the 13C isotopes are not distributed uniformly in the inner tubes. A semi-empirical method based modeling of the Raman modes under 13C isotope enrichment shows that experimental data is compatible with the presence of 13C rich clusters which are embedded in a natural carbon containing matrix. This material may find applications in quantum information processing and storage using nuclear spins as qubits.
@article{arxiv.1611.03623,
title = {Controlled isotope arrangement in 13C enriched carbon nanotubes},
author = {János Koltai and Gréta Mezei and Viktor Zólyomi and Jenő Kürti and Hans Kuzmany and Thomas Pichler and Ferenc Simon},
journal= {arXiv preprint arXiv:1611.03623},
year = {2017}
}