All Title Author
Keywords Abstract

Physics  2003 

Addition Energies of Fullerenes and Nanotubes as Quantum Dots: The Role of Symmetry

DOI: 10.1103/PhysRevLett.91.116803

Full-Text   Cite this paper   Add to My Lib


Using density-functional theory calculations, we investigate the addition energy (AE) of quantum dots formed of fullerenes or closed single-wall carbon nanotubes. We focus on the connection between symmetry and oscillations in the AE spectrum. In the highly symmetric fullerenes the oscillation period is large because of the large level degeneracy and Hund's rule. For long nanotubes, the AE oscillation is fourfold. Adding defects destroys the spatial symmetry of the tubes, leaving only spin degeneracy; correspondingly, the fourfold behavior is destroyed, leaving an even/odd behavior which is quite robust. We use our symmetry results to explain recent experiments. [Phys. Rev. Lett. 91, 116803 (2003).]


comments powered by Disqus