Dimerization structures on the metallic and semiconducting fullerene tubules with halffilled electrons
Abstract
Possible dimerization patterns and electronic structures in fullerene tubules as the onedimensional piconjugated systems are studied with the extended SuSchriefferHeeger model. We assume various lattice geometries, including helical and nonhelical tubules. The model is solved for the halffilling case of $\pi$electrons. (1) When the undimerized systems do not have a gap, the Kekule structures prone to occur. The energy gap is of the order of the room temperatures at most and metallic properties would be expected. (2) If the undimerized systems have a large gap (about 1eV), the most stable structures are the chainlike distortions where the direction of the arranged transpolyacetylene chains is along almost the tubular axis. The electronic structures are ofsemiconductors due to the large gap.
 Publication:

arXiv eprints
 Pub Date:
 October 1992
 arXiv:
 arXiv:condmat/9210010
 Bibcode:
 1992cond.mat.10010H
 Keywords:

 Condensed Matter
 EPrint:
 submitted to Phys. Rev. B, pages 15, figures 11