Electronic Properties of Ultra-Thin Aluminum Nanowires
  We have carried out first principles electronic structure and total energy calculations for a series of ultrathin aluminum nanowires, based on structures obtained by relaxing the model wires of Gulseren et al. The number of conducting channels is followed as the wires radius is increased. The results suggest that pentagonal wires should be detectable, as the only ones who can yield a channel number between 8 and 10. 
F. Di Tolla, A. Dal Corso, J. A. Torres, and E. Tosatti